From my perspective, it's very close between Sony and Nintendo but Sony has the edge for me personally because first off, no one can deny the immense success and innovation Nintendo has brought in for this gen and producing quite a number of mega selling games, SMG, SSBB, DKCR, Mario Kart, etc. Not to mention the extreme success of the DS and soon to be 3DS.
But the reason why Sony had the edge for me was because their games appealed to me more. No they don't go selling mega busters like Nintendo's titles but Sony's IPs and the games they released during this gen provided me with as Sony would call it, 'first class entertainment I would expect from PlayStation'. And I got exactly that. Not to mention I got great joy out from playing the PSP and the awesome games on that as well. So that's why I chose Sony.
Close runner up to these two for me would be EA. With the exception of EA Sports, I pretty much loved most of their titles.
