I wish I could easily source the various titles mentioned so I could view them comparatively.
In chronological order
Prometheus (2012), set in 2089
Alien: Covenant (2017), set in 2104
Alien (1979), set in 2122
Alien: Romulus (2024), set in 2142
Aliens (1986), set in 2179
Alien 3 (1992), set in 2179
Alien: Resurrection (1997), set in 2381
My opinions on those movies:
Prometheus is okay as a standalone movie but messy with the lore and doesn't really fit with the original. This would be my Number 3. It has creative ideas but the movie is hindered by characters that make mostly retarded choices. It's tolerable as a standalone movie.
Alien:: Covenant is a mess. Ridley must have lost his mind around the time he made this movie. While answering some of the questions raised in Prometheus the movie raises new questions it never answers and the movie ends on a cliffhanger. The movie flopped and we never got a sequel or resolution. I suppose this would be my Number 5 but I have no inclination to watch that again.
Alien is a fantastic creepy horror movie but once the monster is out of the bag it's been done and can never be repeated successfully. That's why Big Cjap is fully revealed only near the very end. If you can see the monster your mind can deal with it. Only an unseen horror is truyly horrifying. My number 1.
Aliens is a great action movie with body horror. It falls flat in terms of more than some suspense. My Number 2.
Romulus is a mashup of what's considered the best parts of the whole franchise. It sort of succeeds, making it sort of a success if you like shiny things. It falls completely flat in the second half of the movie that deteriorates into dumb fecal matter and nothing but fan service. The self-referential quoting is cringeworthy. The acting is mostly blah as are the characters. I was rooting for the xenomorphs. The visuals are mostly good with some really creative F/X. This would be my Number 4 but that's not saying much.
Alien 3 is an okay stand-alone movie but it just doesn't fit in the series. Some of the acting is pretty good. I'll rate that Number 3 alongside Prometheus.
Alien Resurrection is hot garbage. You could not get me to watch that ever again.
In my opinion all the Alien/Predator crossovers are terrible. If they make an Alien/Predator/Blade Runner crossover - I'm sure they think that's a brilliant idea because all three franchises are set in the same universe, I'll scream.
Nobody hears you scream in your home theater.