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My favorite Pathfinder games have been those where the DM restricts source material, so the party spends less time on hyper-optimized character builds
Which is the polar opposite of the game we just started haha. Hope you end up liking it!
Pathfinder, to me, is at its best at the character creation stage. As noted by others there's an amazing amount of material out there to help spark your imagination and give you interesting ways to implement your ideas. That being said, I firmly believe you can create most (or all) of the same characters in nearly any system, you just need to be creative and have a DM that's willing to work with you.
It also has a huge number of pre-written adventure paths for DMs that aren't as creative or just plain don't have time to write their own stuff. This, and the fact that the rules/materials are basically free to access online, are the main reasons I've seen people play it.
The downsides for me come in at level 10+ or so. Once you get that high it gets excessively crunchy, even for my groups that enjoy the crunch. There are amazingly complex situations you can find yourself in that give you bonuses and negatives to your rolls, and it just gets silly. There's a reason some people call it "Mathfinder".
Saying one or the other is "better" is clearly a matter of opinion, but my opinion is that it is improved upon 3.5e. I never played 4e. 5e is definitely a more streamlined system that is easier to run and learn imo, but to some it lacks depth. They both have their place in my mind, it just depends on what you're looking for.