It is like comparing DC to PS2, which are also 2 years apart. DC to Wii is an 8 year difference. DC to Wii has zero comparison, whatsoever.
DC to PS2 has a few comparison points, like DOA2 and Crazy Taxi. Between those two games the difference was minimal and even possibly slanted in the DCs favor in a couple aspects, but once you consider GTA: VC, MGS3, etc, it is clear the DC isn't anywhere close, much like NES to SMS. NES had games with special chips that bring it close or better than SMS, but that is pretty much the only way.