The SNES pad is excellent but the D-button sometimes it`s hard to excute in fighting games like Fatal Fury-1, 2 & Special, basically it wasn`t design for fighting games but mostly for platforms, RPGs and shooter.
As for the Genesis 6-Button and the Saturn (BEST PADS ALL TIME for me) their round D-button is excellent it never failed me, in some ways it was intended for fighting games Plus I still have 2 pairs in mint condition.
When I look at the D-button in general the 1st thing comes to my mind is the plastic quality Sega No.1, Nintendo then PS and the worst one is xbox. The xbox analog stick realy gives me pain in my thumbs when using it.
HEHEHEHEHE now lets see what Joysticks you guys like Neo Geo, Ascii or Hori ?