To be fair, it's still too early to say who "won" or not, especially since I feel the defining impact is not so much sales as it is overall impact to future game generations. I mean in the Genesis vs. SNES, Sega pretty much won that in terms of sales, but I would argue the library of the SNES had the greater impact and has been remembered far better than what Sega had to offer.

In a similar fashion, while X-Box had Halo and Nintendo had their flagship franchises, I feel it is safe to say the PS2 had the more memorable and impactful gaming library. As usual, the software determines the winner, not the hardware.