percyhoward
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It's fun to tackle a question like that, recognizing that it's more art than science.
Active: Rodgers, Brady, PManning, Brees, Romo, Ryan, and Roethlisberger, in that order, with the caveat that I wouldn't be too picky about the order.
That said, there's a great disparity in sample sizes for playoff games. (And I'd use playoff games, because no one has kept track of 99.9% of all the win-or-go-home games that have ever been played.) If you look at QB who have at least 9 games of postseason experience, then Brees and Rodgers are clearly ahead of the pack:
Brees 9g 103.9
Rodgers 9g 103.6
EManning 11g 89.3
PManning 20g 88.4
Brady 24g 87.4
Flacco 13g 86.2
Roethlisberger 14g 83.7
The obvious problem is, Brady and Peyton have a lot more games than most of the others. And on the other end, Romo and Ryan haven't had enough games to qualify. With history showing us that the ratings regress toward the mean as the sample grows, is there any reason to look only at postseason anyway, instead of just looking at the player's entire career of games? Who knows? There are QB, with a large enough body of postseason work to be able to judge, and who were great over their careers, who have performed appreciably better than average in the playoffs.
All-time: Starr, Montana, and Warner. All won multiple passing titles, all appeared in at least 10 postseason games, and all had playoff passer ratings well above the average rating of their era. Then you have to mention Ken Anderson, who had all of that and then some, but only appeared in 6 postseason games.
Mark Sanchez has a career playoff rating of 94.3, and Archie Manning has no career playoff rating. Based on the available postseason evidence, who's the better "playoff QB?"
But it's still fun to do.
