Yes we know sales don't matter ... or do they?
Also, we know that PC and Nintendo are not in the race as per se, i mean PC doesn't do gens the same way and Nintendo is happy selling a huge amount of consoles to gamers and none gamers alike, but the real meat of the "gaming rivalry" is Sony and MS.
Under that premise, and after seeing both of their cards for next gen ... who do you think will win? which platform will have the better gaming experience and yes, who will have the better sales? because let's not kid ourselves, they are both in the business to sell hardware.
So yeah, who will win and why ???