Linux vs Windows Server: Pros, Cons and Costs

Choosing between Linux and Windows Server decides what software you can run, how you manage the machine and how much you pay every year. Neither is better in general: Linux dominates web hosting, containers and open source stacks, while Windows Server is the natural home of Active Directory, .NET Framework, IIS and Microsoft SQL Server. This guide compares both on the points that actually change a decision, shows the same administration tasks on each platform and ends with a practical way to choose.

The examples use Ubuntu 24.04 LTS for Linux and Windows Server 2025 for Windows, the current long-term releases of each.

Quick comparison

Cost and licensing

On Linux, the operating system itself is usually free. Ubuntu, Debian, Rocky Linux and AlmaLinux cost nothing to install on as many servers as you want, and security updates are included. You only pay if you want a vendor subscription (Red Hat Enterprise Linux, SUSE Linux Enterprise, Ubuntu Pro for extended security maintenance) or a support contract.

Windows Server is licensed per physical core:

• Standard edition covers the host and gives the right to run two Windows Server virtual machines on it.
• Datacenter edition allows unlimited Windows Server VMs on the licensed host and adds features such as Storage Spaces Direct and Shielded VMs.
• Every server needs at least 16 core licenses, even with fewer cores, and every user or device that accesses it needs a CAL. Remote Desktop Services needs separate RDS CALs.

On a VPS the provider usually bundles the Windows license into the monthly price, so compare the total monthly cost of the same plan with Linux and with Windows rather than list prices. The difference grows with the number of servers, which is why large fleets of web or container hosts are almost always Linux.

Resource usage

A minimal Ubuntu Server install without a desktop idles at a few hundred megabytes of RAM and a few gigabytes of disk. Windows Server Core is much lighter than the Desktop Experience edition, but still needs more memory and disk than a minimal Linux install; Microsoft lists 32 GB of disk as the minimum for any installation.

You can check idle usage yourself on a fresh Linux server:

free -h
df -h /

               total        used        free      shared  buff/cache   available
Mem:           1.9Gi       310Mi       1.2Gi       1.0Mi       520Mi       1.6Gi
Swap:             0B          0B          0B
Filesystem      Size  Used Avail Use% Mounted on
/dev/vda1        48G  2.4G   46G   5% /

The equivalent on Windows Server, in PowerShell:

Get-CimInstance Win32_OperatingSystem | Select-Object @{n='FreeMB';e={[int]($_.FreePhysicalMemory/1KB)}}, @{n='TotalMB';e={[int]($_.TotalVisibleMemorySize/1KB)}}
Get-PSDrive C

For small VPS plans (1 to 2 GB of RAM) the lower overhead of Linux leaves noticeably more memory for the application. On larger machines the OS overhead becomes a small fraction of the total and stops being a deciding factor.

Security model

Both platforms can be run securely; the difference is in how the defaults and the tooling work.

Linux

• Minimal install by default: only the services you install are running and listening.
• Mandatory access control through AppArmor (Ubuntu, Debian) or SELinux in enforcing mode (Rocky Linux, RHEL).
• Ubuntu installs unattended-upgrades and applies security updates automatically. Kernel updates need a reboot unless you use a live patching service such as Canonical Livepatch.
• Access is usually through SSH with key authentication, which is easy to lock down.

Windows Server

• Microsoft Defender Antivirus, Windows Firewall and Credential Guard are built in.
• Updates arrive monthly on Patch Tuesday and usually require a reboot. Windows Server 2025 supports hotpatching (updates without reboot for most months), which requires an Azure Arc subscription outside Azure.
• Centralized policy through Active Directory and Group Policy is a strong point in environments with many Windows machines.
• RDP exposed to the Internet is one of the most attacked services; restrict it to a VPN or trusted IPs.

Basic hardening on Linux looks like this (Ubuntu 24.04):

sudo ufw allow OpenSSH
sudo ufw enable
sudo systemctl status unattended-upgrades

And the rough equivalent on Windows Server, limiting RDP to a management network:

Set-NetFirewallRule -DisplayGroup "Remote Desktop" -RemoteAddress 203.0.113.0/24
Get-MpComputerStatus | Select-Object AMServiceEnabled, RealTimeProtectionEnabled

Replace 203.0.113.0/24 with the network you administer the server from.

Everyday administration side by side

The same tasks exist on both systems; only the tools change. The Linux commands are for Ubuntu 24.04 and the Windows ones for PowerShell running as Administrator.

Creating an administrator user

On Linux, create the user and add it to the sudo group:

sudo adduser your_user
sudo usermod -aG sudo your_user

On Windows Server:

$password = Read-Host -AsSecureString "Password"
New-LocalUser -Name "your_user" -Password $password
Add-LocalGroupMember -Group "Administrators" -Member "your_user"

Managing a service

On Linux, services are systemd units:

sudo systemctl enable --now nginx
systemctl status nginx

On Windows Server, services are managed with the *-Service cmdlets:

Set-Service -Name W3SVC -StartupType Automatic
Start-Service -Name W3SVC
Get-Service -Name W3SVC

Installing software

Linux installs almost everything from the distribution repositories:

sudo apt update
sudo apt install nginx

Windows Server installs roles and features with Install-WindowsFeature, and third-party software with installers or winget:

Install-WindowsFeature -Name Web-Server -IncludeManagementTools

Remote access

Linux is managed over SSH from any operating system:

ssh your_user@your_server_ip

Windows Server is managed over RDP for the desktop, PowerShell Remoting for scripting, or OpenSSH, which is included as a built-in feature. On Server Core, SSH or PowerShell Remoting is often more convenient than RDP.

Application compatibility

Application support is usually what makes the decision for you.

Runs best, or only, on Linux:

• Nginx, Apache, Caddy and most of the PHP, Python, Node.js, Ruby and Go ecosystem.
• Docker and Kubernetes. Almost every public container image is a Linux image.
• PostgreSQL, MySQL/MariaDB, Redis, Elasticsearch/OpenSearch, ClickHouse.
• Control panels such as cPanel, Plesk (also on Windows), CyberPanel and HestiaCP.
• Networking and security tools: WireGuard, HAProxy, BIND, Postfix.

Runs best, or only, on Windows Server:

• Active Directory Domain Services and Group Policy.
• Applications built on .NET Framework 4.x, classic ASP and IIS-specific modules.
• Microsoft Exchange Server, SharePoint Server and Remote Desktop Services.
• Many line-of-business applications (accounting, ERP, industry software) that only ship Windows installers.

Runs well on both:

• Modern .NET (.NET 8 and later) applications, which are cross-platform.
• Microsoft SQL Server, which has official Linux packages for Ubuntu and RHEL.
• Java applications, Node.js and Python services.
• Game servers, depending on the game; many dedicated servers ship builds for both.

If a critical application ships only for one platform, that choice is already made. If everything you run is cross-platform, Linux is usually cheaper and lighter.

Migration considerations

Moving between platforms is rarely an in-place change; plan it as a rebuild.

• Windows to Linux: move .NET Framework apps to modern .NET first, replace IIS with Nginx or Apache, export SQL Server databases or run SQL Server on Linux, and replace Windows file shares with Samba if clients still need SMB. Scheduled tasks become cron jobs or systemd timers.
• Linux to Windows: check that every dependency has a Windows build, and consider running Linux-only components (Redis, some container images) on a separate Linux VM rather than porting them.

In mixed environments the most common setup is Windows Server for identity (Active Directory) and Windows-only applications, and Linux for web, databases and containers. Linux servers can join an Active Directory domain with realmd and sssd, so users keep one set of credentials.

Which one should you choose?

Choose Linux when:

• You run web applications, APIs, databases or containers.
• You want the lowest cost per server and minimal resource overhead.
• Your team is comfortable with the command line and automation tools such as Ansible.
• You need the newest open source software or want full control over the system.

Choose Windows Server when:

• You need Active Directory, Group Policy or Remote Desktop Services.
• Your applications depend on .NET Framework, IIS-specific features or Windows-only software.
• Your team already manages Windows desktops and servers and knows PowerShell.
• A vendor you depend on only supports Windows.

Use both when you have a Microsoft identity or application layer but also run modern web or container workloads: keep each workload on the platform it was built for.

Conclusion

The operating system should follow the workload: Linux for open source stacks, containers and cost-sensitive fleets, Windows Server for Microsoft-centric infrastructure and Windows-only applications. List the applications you need to run first, then compare licensing and administration effort for the platforms that support all of them. As a next step, if you choose Linux, compare the main server distributions in the Ubuntu vs Debian vs Rocky Linux guide, and harden your first server with SSH keys and a UFW firewall.