For flavor I definitely go for CTS. I hate sauces that are mostly vinegar. That one is not.

For pure heat, a nice Dave's Insanity Sauce Spacial Reserve. (apologies to other Daves with different sauces ). To try it, they make you sign a waiver (just for fun, I'm sure, but it adds micely to the mystique) and they dipped the tip of a toothpick in the stuff. From that one drop, my mouth hurt for hours and I thought I had indegestion.