My recommendation right now would definitely be 4k77 or Silver Screen Edition v1.6, 4k83 and the official 2020 FHD or 4K blu-ray (or D+) for ESB. That is until 4k80 is released. Then it’ll most probably be all the project 4kXX preservations only.

Anyway, these are the only really watchable versions right now, in my opinion. I also prefer the original 4k77 v1.0 and 4k83 v1.0 as basically all the other versions released by fans tend to fix one problematic scene/shot while messing up many others at the same time.