The industry standard for shared hosting security and resource isolation. CloudLinux OS 10 (2025/2026) is built on AlmaLinux 10 and features LVE limits, CageFS, and PHP Selector. While its ability to prevent the 'Bad Neighbor' effect is unrivaled, the shift toward a conversion-only install (from AlmaLinux) and rising legacy license costs make it restrictive for non-hosting environments.

The enterprise standard for Windows-native environments. The 2026 '25H2' version features AI-ready GPU partitioning, Hotpatching (updates without reboots), and 90% faster NVMe storage throughput. While it remains the gold standard for Active Directory and SQL Server, its high cost, complex CAL (Client Access License) requirements, and forced Azure Arc integration for new features make it restrictive.