A lot of people underestimate him, but the Gamecube managed to be profitable even releasing at $200 and selling only 21m, not to mention it still had loads of great and harcore games (F-Zero GX, Metroid Prime, Wind Waker, Resident Evil 4 etc.) and the neatest controller ever.
Let's not forget also it introduced a hardware design (the Power PC / ATI with embed memory combo) that was incredibly cheap for it's power and became so sucessful it turned out to be the standard today for consoles, bar the "alien" PS3, and very likely it'll be used next gen by all of them.
That's why the Gamecube gets my vote even if the SNES was greater for his time.