General consensus is that Weeks, Bayless, and Smoger are the three best refs in the business. I don't think I have a preference although I am always happy to know when Bayless or Smoger are reffing. I always liked Frank Cappuccino before that.
Both a great refs. Bayless might be a little more polished and have better judgement but I like Smoger's willingness to give hurt fighters the benefit of the doubt to continue.