As for the best QBs being defined by the number of SBs, lets consider the top 10 QBs statistically (ranked by adding all-time rank in TDs, Yards and Completions, sorting smallest to largest, smallest being 3) and how many SBs they won versus played in.
1) Marino (0/1 in Super Bowl)
2) Favre (1/2 in Super Bowl)
3) Elway (2/5 in Super Bowl)
4) Moon (0/0 in Super Bowl)
5) Tarkenton (0/3 in Super Bowl)
6) Testaverde (0/0 in Super Bowl)
7) Montana (4/4 in Super Bowl)
8) Bledsoe (0/1 in Super Bowl)
9) Fouts (0/0 in Super Bowl)
10) Krieg (0/0 in Super Bowl)
Thus, with exception of Montana, the other 9 of the top 10 more prolific passers of all time combined to win 3 Super Bowls in 12 tries. Montana won more than all of the other 9 combined in 33% as many tries. Thus, there are only 7 Super Bowl wins and 16 Super Bowl games to split between the top 10, and even those guys had a combined losing record of 7-9.