>>43318153You literally cannot find a more loaded question for this board.
I've played Pathfinder, DnD 3.5 and DnD 4 and 5. Here's my shitty opinion:
Play pathfinder if you like lots of variety in base class. They're relatively balanced and I can't think of a single class that is actively unfun to play. It's complex, but supported and the quality's there when it comes to the books and adventure paths, but the writers are shitty people and are getting less and less able to keep their dicks and politics out of the adventure paths.
Play 3.5 if you want ten thousand books to pick from. Less balanced than pathfinder (Just my opinion, it's up to you in the end) but has some interesting classes, and tons and tons of prestige classes. Overall about the same experience as Pathfinder, if a little less streamlined.
DnD 4 is great if you aren't playing a fantasy game. It's great as a beer and pretzel game, and I really like it for Gamma World, but it's pretty terrible at ACTUAL DnD.
DnD 5 is balanced and fun, although since it's brand new there's not much variety in classes from the basics. Magic is nerfed to hell and back but you won't care because it's fun anyway and you don't spend hours trying to build a character. Much more roleplay focussed IMO, since the mechanics are less binding. Very Pick-Up-And-Play, and just good overall, but the adventure books are incredibly shitty as far as I've found.