The way things have panned out so far I'd say that Manning/Maclin is currently the better of the two. However I think that Hasselbeck/Jennings has much more potential.
I guess I didn't really answer your question, did I. I'll try again.....
Both QB's are suspect for injury so let's not consider that. The Giants have had a creampuff schedule so far. It gets a lot tougher starting this week. Seattle is in a very weak division. Advantage: Hasselbeck.
Maclin showed some flash last week but has otherwise been rather nondescript. Jennings has not lived up to his billing thus far but GB has had some difficult matchups. He'll bust out this week. Advantage: Jennings.
I'm going Hasselbeck/Jennings.
I know it's a long read and confusing, but could you take a stab at this: viewtopic.php?t=455526