Digital Foundry's PC controllers guide

Obsessed with mushrooms so much you can't imagine playing games without those?
The #1 reason you just refuse to throw the console garbage away and buy yourself a monster PC is no-mushrooms?

Eurogamer brings an article comparing all those ABXY and triangle/rectangle/circle/X whatnot:
http://www.eurogamer.net/articles/digitalfoundry-2016-pc-game-controller-guide

While you won't see "this one is the best" there, the article is thorough on every reviewed controller.