Brief info: I'm 32 yo, 5'11" and 200 lbs. (to give idea of how big my hands in relation to review)

US Controller:

Pros- Built Sturdier, Heavier
L and R buttons employ more pressure when pushed
(Good for Halo)
Start Button is in the Middle (which most of controllers are)

Jap Controller:

Pros- ABXY buttons are more spaced out, and more perpendicular to the layout (helps in doing Tony Hawk tricks)
D-Pad is not recessed like in US version, makes handling easier (but US Controller D-pad is more aesthetically pleasing)
Both Left and Right analog stick sport the recessed middle part as in the left analog stick of US version (though the right stick of US looks cool, for me it is nicer to use the left stick)


Middle Ground: Still don't know whether the position of the white and black buttons in US is better than in Jap, maybe when i get my JSRF and TH3, then i can tell.