Clifton is not much of a run blocker, but he specializes in shutting down elite pass rushers, which is what LT's are paid to do. Tennessee's RE, Kyle Vandenbosch, was out with an injury yesterday, so Colledge was playing against a backup. He did his job well, and I give him credit for that, but we don't know yet how he will play against an elite pass rusher.
So for now I would still go with Clifton, but I was encouraged by Colledge's performance yesterday. To me, he's always looked more natural at tackle than at guard.