I am currently trying Unreal to look at how the engine might produce an open world environment. A few studios and HE use it so it could be worthwhile getting to grips with. It will be interesting to see how the engines differ from each other.
Following a pathway on Unreal Learn, I found it easier to go through the course, ‘Making the Switch from Unity to Unreal Engine’, rather than begin with Unreal starter courses. This meant that the main challenge would be learning the new terminology and layout rather than the essential functionality, which seem pretty similar.
It was fairly straightforward to understand how unreal differs from Unity (in principle) having spent 2 years with the Unity Engine, but Starting with a simple project to start with will allow for a practical tour around the engine.