I have no real stats to back this, but Kolb for me. I mean, he was the starter in Philly all preseason, so its not like he does not know the offence. And it is a good offence as well.
And just frankly, I think he has every reason to go nuts and remind everybody that it should be his job. So if its 21-0 in 3rd quarter, he might still bomb it out for DeSean to pad his stats.