I'm assuming prewett meant 16 bit, which would be the SNES. The only comparison I've seen people make between the N64/Gamecube and NES/SNES is that sprite-based games aged better than early 3D games.
He might be talking about the N64 (which IIRC most games used the set of 32-bit instructions because they were faster and "accurate enough" at the time. - Not sure, though.)
Gamecube?