While playoff wins are important in establishing a QB's worth, Stafford's rate of growth, even with slip-ups like the Bears game, is more impressive to me than Sanchez's. Especially considering Stafford basically didn't play at all last year.

Even if you don't buy overall growth, Stafford is having a much better year this year than Sanchez. Considering Sanchez has played close to double the amount of games that Stafford has, I would hope he'd be showing more consistency.