The difference between XMen vs SF on PS and SS is so significant, it's like comparing an 80s arcade game ported to both NES and Genesis. The Sony version is so incredibly f*cked up and terrible that you can't even play it the same way. It's a different game and a much worse one. It ain't worth a broke dick. The Saturn version has a *little* bit of slowdown and a few minor issues, but it's otherwise arcade exact. The SS version is one of the greatest arcade ports of all time, the PS one is...there are much worse arcade ports, but mostly for 2600 or NES. The thing sucks.