Well, Rondo is the best point guard in the League outside of Chris Paul, and playoff Rondo is even better, so it's not that hard to tell. Sully is a great player, he doesn't play like a rookie and he was limited by his back, but Rondo is an All Star.
Sully wasn't 100% healthy before he was out for the season, so he may be an even better player after surgery. I hope they're both 100% healthy by next January.