I'm inclined to say Shavlik Randolph, at least he's active and is getting offensive boards. Wilcox looks completely lost these days and Brandon Bass is just undersized and never even tries to get offensive boards anymore.
I really liked the way the C's started the second half against the Pistons with Bradley, Pierce, Green, Bass and Wilcox. It was the first time in a while that we haven't played a completely undersized line-up. I'd just say that I think Randolph is better than Wilcox right now and should probably be getting more PT.