Who has better stats?
Who has more clutch moments?
Who has more playoff success?
You should not have asked the first question if you wanted to make the case that Flacco is better than Tannehill. Statistically, Flacco has been bad or downright dreadful the past few seasons. And it started BEFORE he tore his ACL, thank you very much.
2015: 14 TD 12INT 6.8 Y/A
2016: 20TD 15INT 6.4 Y/A
2017: 18TD 13INT 5.7 Y/A
I don't think I even need to post Ryan Tannehill's statistics, as we've argued them to death already, and we all know he's been more productive than that in the last three years that he played.
Normally I'd argue that it's not all on Flacco, but since we're arguing this using YOUR criteria, I don't feel compelled to make any kind of reasonable arguments here. Rather, I'll just let the numbers of the Ravens' pass offense since 2015 speak for themselves.
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As for clutch moments, I don't know how you would define that. If you want to use 4th quarter comebacks, Flacco has 19 of those in 154 games (12%) and Ryan Tannehill has 12 in 77 games (16%). I don't know what other criteria you want to use.
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If you want to use playoff success? The answer is Flacco. The Ravens won the Super Bowl with Joe Flacco as their starting quarterback, and he played very well in the post-season. That's definitely the best argument for Joe Flacco. He was Great with a capital G in the 2012 post-season.
Really, I don't like or dislike Joe Flacco. I just post this because it's so easy to show how lazy and bad your argument is. The fact that you just throw this stuff out there without bothering to actually look up the things that can be looked up is incredible.