The only two movies in this franchise that are watchable are Alien and Aliens. The first is great, the second is really good. Theatrical cuts all the way for both. Cameron’s director’s cut is unwatchable, and Scott’s is unnecessary.
I like about half the scenes in Cameron’s Director’s cut. The early scene with Newt and her family is really bad, but the sentry gun stuff is great. I like it when Hicks and Ripley exchange first names, but hate the extended discussion of the Alien social structure in medlab.
I think Alien 3 is watchable, but not enjoyable. Prometheus was half-baked; either be a prequel or don’t be. A lot of compromises in it, and I would guess pressure from the studio to tie it into the main Alien Series. Have not seen Convent or whatever it is called and have no interest in doing so.