I suppose that the CL3VER platform would be like what you outlined second there - they presumably run the simulation on their servers and thus the user gets a really smooth experience.
So yeah, Im pursuing learning UE4 - even if it only lends best to an in-house kiosk experience.
My No 1 thing that i would like to learn is how to get the same ‘scene to scene’ camera moves that are user-triggered - to navigate the user around the scene, and text to layout nicely to explain to the user what they are seeing etc
If you knew of any tutorials that might hint at that, that’d be nice 
I will do my own investigation too
thanks for the info