I'm going to give a short analysis of each group:
Marino, Fouts, E.Manning, Roethlisberger
Marino put up great stats and is no doubt one of the all time greats. He's too often underrated because of his lack of an SB win. All the old school "greats" are essentially the same as far as I'm concerned, so those are "wash" picks. Eli and Ben are clutch in key situations and are good but not amazing otherwise.
Bottom line: Marino is the only QB in this group that strikes me as elite.
Rodgers, Brees, Namath, Plunkett
Rodgers and Brees both have amazing passing ability and put up great stats. They're both elite in the modern age and will prove it further if they continue the way they've been playing. Namath and Plunkett are both old school.
Bottom line: Rodgers and Brees are good but the old school focus isn't impressive.
Elway, Staubach, Warner, McNabb
Elway is clearly one of the best. Staubach is old school. Warner is right up there in the top ten all time. McNabb is under rated but rounds out this group nicely.
Bottom line: Two top ten QBs and an often under rated McNabb make this a good group with just one old school pick.
Unitas, Favre, Moon, Tittle
Favre is a great QB and Moon was good in his time, and there are two old school picks here.
Bottom line: Only Favre is top ten material from this group, and without him, this group doesn't compete with the others here at all.
Young, Graham, Baugh, Anderson
Similar to the last group: One potential top ten QB all time, but now with three old school picks, its like Young has to carry this group for it to be better than any other.
Bottom line: As I said, Young carries the group, and the old schools are just a wash. Nothing overly impressive.
Brady, Tarkenton, Dawson, Greise
This group is like the last two except it has no top ten all time QB to carry it.
Bottom line: Three wash QBs and an over rated modern QB don't get it done here. Worst group so far.
P. Manning, Starr, Kelly, Jurgenson
Peyton is top ten all time and so is Kelly. Two true stars carry this group that features two old school picks.
Bottom line: With two high level QBs, this group is high quality. Only real competition is the very next group.
Montana, Bradshaw, Aikman, Cunningham
The group has just one school pick and features a top ten all time QB and one who could easily make the top 20. Bradshaw was over rated and often still is, and Cunningham had some skill in his time.
Bottom line: One great QB, one fairly great. The only real competition for this group is the one directly above it.
And the winner is...
P.Manning, Starr, Kelly, Jurgenson
The last two groups clearly are a cut above the rest. Bradshaw, Starr, and Jurgenson are all a wash and basically so is Cunningham, leaving P. Manning and Kelly against Montana and Aikman.
Peyton and Montana are both great QBs, but Peyton has shown more ability while Montana gets credit for SB wins, so the edge goes to Peyton.
Same story with Kelly and Aikman - both skilled, Aikman has the SB wins while Kelly lost four times. They basically wash each other out.
Marino, Fouts, E. Manning, Roethlisberger