I am currently playing Outer Worlds (~15 hours in) and it's a huge improvement over say Fallout 4 but I think that Atom RPG scratches that Fallout 1 & 2 itch much much more closer.
Outer Worlds is well written and funny space romp with rather little roleplaying (you have seemingly tons of options, but often the results only affect the next dialog line and the game is so easy that the player quite often can pass any skill test) while Atom RPG is dark, hard and bleak post-apocalyptic role playing game where almost any situation can play out in so many different ways depending on your skills and luck. Atom RPG is Fallout 1&2 worship to its core, with all of the flaws of the original 2 included.
I am not saying that Outer Worlds is objectively a worse or better game, it's just different.
I feel like Outer Worlds is a successor to Fallout 1 and 2. i felt like it was mostly about the story and not about the open-world freedom that the games from Fallout 3 onward have provided. That's not to say it's bad game. I think there are (at least) two main Fallout camps: those that enjoyed the story-driven worldbuilding from the older games and FNV as well as those that enjoy the agency in the newer ones. If you fall into the first camp, Outer Worlds is fantastic.
I'm enjoying it more than I did F4, honestly, but that's partly because I really really hated the "build and support villages" aspect of F4.