That’s much nicer people who want to seem like an expert who don’t know the answer just telling me my question is wrong 
So I have been doing more reading based on what I have been told.
It sounds like if I have a program that can make .FBX objects and surfaces I can just use UE4 without any need for Unity?
It also seems like maybe there is flat, pre rendered, click through VR experiences which are more high res but not real time rendering etc. there are true 3D real time games.
What software would I need if I wanted to make the flat pre rendered stuff first? Can UE4 do that? I want to do the UE4 stuff too. I want to try a lot of things out and see what advantages each way has.