Which ones have you bought, and how often do you use them? And for what games? If you have found some quality stuff I want to know about it!
I have the Nyko Pro Commander, the PowerA mini Wii U Pro, and the Hori Battle Pad. I also have the PDP Fight Pad, but that thing is bulky. Prettyer, much, much prettyer, and I suppose if you have massive hands, it'd be good. But even with My larger than normal hands, it's too much, akin to the original xbox controllers. The Nyko one I've used for Mario Kart, and it's lasted through hours of that, and I went through all of Pikmin 3 with it. The PowerA is really small; I really only got it for my nephew, and he's rough with controllers, and it's lasted through many games of Mario Kart. The Hori is the best Classic Controller; I love that thing. It's exactly like the GameCube controller, except it is read as a Classic Controller. And, crucially: ZL and ZR are the top triggers, with L and R at the bottom. I use that one for anything that is compatible with the classic controller, even Smash was I sit farther away than the wires go. I honestly won't get this ProCube if the triggers aren't like that. I would buy eight of them in a heartbeat, if they're designed as well as the Hori. I've also had many third party wireless controllers for GameCube, and PS2. The issue there was bulk. If you like the official GameCube controller, though, Hori is where it's at. Neither PowerA or the Nyko have flipped triggers, but they're mostly used for Mario Kart, and the Nyko I only ever used with Pikmin 3. I tried those two with Smash, and I didn't even last a full match. Even with remapping the buttons, it was awful.
There are myths of an FPS Pro Wii U Pro controller; but I've never found it. If you find it, do let me know.
