The bonus features of the PS3 version are really worth it, like extra blood and super sweet mode.
The only thing that made more sense on the wii believe it or not was the gimmick motion controls. They did a fine enough port of that to an actual controller, but it still feels more limited than what the wii had to offer.
Also don't forget that you can deflect bullets with a perfect guard, because the game doesn't tell you that.
tl;dr: Play NMH1 on PS3 and NMH2 on Wii with a downloaded save file of NMH1.