I can't stand Sony Playstation pads. Both the D-pad, which has hardly any movement in it, and the small, convex buttons suck for fighting games and platformers. I prefer to use aftermarket Playstation compatible pads, like the Nubitech Street Fighter pads which have a nice rolling D-pad with plenty of movement in it, and six big face buttons (plus two shoulder buttons). Same layout as the Saturn pad pretty much, but since those pads are out of production I'd probably go for a pair of Saturn pads with PSX plugs on them, and get some of these PSX-CD32 adapters.
By the way, you can see one of these adapters in action in the latest Tracker Hero video here -
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