This thread is all well and good and harmless but anyone who wouldn't take the best QB in the game -- whoever they think that is -- has something wrong with them. If I thought I had the second best QB in the game and someone asked me this question I would still take the best QB.
Minute differences in quarterback skill and talent level are worth more than elephantine differences at other positions. I mean, defensive linemen? We've had one of the best pass rushers in the game for the better part of like five years and we're still painting a big yellow line down the middle of the road. The buck stops behind center.
The answer is Aaron Rodgers. Or Peyton Manning. Or Tom Brady. Or maybe Drew Brees or Andrew Luck. There are no other answers. You can like Ryan Tannehill -- you can like him a lot, even. There are no other answers.