>>713029506
Narratively speaking i think the legion ending is the most interesting.

Ncr Victory turns fallout into a western but with radiation. All the interesting conflict is on the ncr frontier.
Mr house/courier endings are just "another prewar faction" for you to visit or just turning fallout into a really shitty cyberpunk.
But after ceasar dies you can do pretty much whatever the fuck you want. You can have a legion civil war between his successors. You can have feuding clans amongst the legion tribes. You can have a rebellion against the legion. You can have death cults developing under legion rule. You can have aliens or mutants threaten a weak and unstable legion. You can even have you play as a pretender to the throne of the legion. Its more medieval-like but doesn't take away from the fact its a post-apocalyptic setting where humanity is struggling to survive.

It also has the benefit of moving everything away from modern politics as it enables you to do stupid factions whose entire ideology is just a thought experiment