My personal favorite is Fallout New Vegas! I just love the story, characters, and vibe of the game. It really is a love letter to the first 2 original Fallouts and roleplaying games! Tell me yours!
i really like 4! i know it has it's weird moments and odd lore issues, but overall the look and characters just keep driving me back. i really do have a soft spot for every companion in this game in comparison to the others, too :3 also the base building is super fun!!