Unreal 4 vs 5 for Robotics development

Unreal is a games engine primarily based on Windows,
There are versions for Linux, support is minimal

What Is Isaac Sim? — Omniverse Isaac Sim latest documentation

Isaac Sim has essential features for building virtual robotic worlds and experiments and its Linux based,

The best unreal is the 4.27 and NO SUPPORT for robotics in UE 5