It's not even close right now. Tannehill is establishing himself as a very capable starting QB. Geno has a long way to go still.
Tannehill is definitely better but its not even a fair argument because Geno has only played 5 games.
Another valid point. Geno still has a long way to go. It would be more fair to compare where he is when he's played as many games as Tannehill has. I am making a mental note to revisit this thread after week 5 of the 2014 season.