Well I can't afford spending heaps of money in arcades, and not to mention I still haven't found a spacey parlour the has tekken on the list so I can't be sure wheather jystick is better but im betting keypads are still better, cause I was wondering how you would press double foward on a joystick but then realised that you'd have to kinda tap it quickly to the side or something wich sounds like alot or strain on the wrist.

But I suppose that you'd have to develop you own techniques.