Okay, some of the "best" (and by best, I mean ironically so) controllers are those ones with more extraneous features than you can count, let alone need. Like, I have this Nyko Air Flo controller that's got a fan built into it... AND it's wireless... AND it has a receiver with two memory card ports on it. Also, it's unreasonably large, not Xbox Duke bad but getting there. Then there's Bandai's MEGA for the NES, a big game pad with an LCD screen and features up the wazoo. Do you want turbo? You've got turbo. Do you want to adjust the speed of turbo? You've got that, too. Do you want to test your finger speed in this bonus game? Yeah, get your Master Higgins on. And if you manage to press those buttons more than seventy times in five seconds, we'll open up a secret video game on your game controller that's already playing a video game. There's also macros and an "arsenal" feature that limits button presses to a specified amount. So it's like you've only got fifty bullets in Contra or something.
It's too much controller for anyone to realistically need, in both size and features, but it's out there if you want it!