Tough call. The back side of Oakmont if I had to pick just one, probably because of the intrigue that holes 14 and 17 provide with the many options off the tee. It's a toss-up between the front and the back I think, but I'll give the nod to the back for those two holes. From a player standpoint I just like Oakmont in general. It forces me think through every shot and provides a great challenge. I promise I'm not just saying that, I actually do love playing on that course. =)