Due to a superior risk/reward element, I believe the 15th hole is the better Par 5 at this point at the Masters. I watched a lot of the coverage on the Amen Corner and 15/16 channels and the 15 is clearly the superior hole for the elite players.
A bogey on 13 is increasingly rare, and there is almost all reward, and hardly any risk in going for the green in two. Even Rory somehow made a par from the Azaleas. If you put the ball in the water, you can still make 5.
15, though, is far more interesting. If you hit a bad tee shot, going for the green becomes very challenging, and you are forced to make a difficult layup, which hardly every leads to a birdie. And if you saw Sergio on Day 1, that pitch is brutal.
Thoughts? My opinion is based on the hole's challenge to the tournament player, not its architectural merits.