I find the original XBOX's controller to be the best one.
And I do mean the supposedly "bulky" one, not the pity full "revised" ones. Because the bulky one has the layout of an arcade board, with two rows of three buttons each, which in turn makes it ideal and perfect especially for fighting games and also racing games (in my opinion). I occasionally play Killer Instinct on MAME and I wouldn't see myself trying to to the light kicks and punches with two missing buttons that'd be located "under" the controller, either as triggers or even on top like the L and R SNES buttons (which was the reason why I hated the SNES port of KI too).
But yes, that's all just my opinion, so basically it's meaningless indeed.