Nestopia or Fceux

Nestopia (Performance wise) or Nestopia UE but they dont have a frame counter, FCEUX runs worse on stream / video but has a frame counter and Bizhawk is laggy so don't use it unless you have a good computer

The accepted platforms list is always available by clicking the "View Rules" button on the leaderboard.

I would say NEStopia is the best emulator for this. Also, if you go into fullscreen (by pressing alt+enter), you’ll have minimal input delay.

Go into input and you can change what key does something.