There are many opinions and many threads on this subject. Best for what? Horspower, drone, no drone, single shot, dual, etc.. You need to decide what you want your exhaust to do for you. In my case I wanted the quietest free flowing exhaust will little restriction. I have a 3 inch dynomax vt feeding a single inlet dual outlet 3 inch dynomax ultra flow. Many different combos out there. The only real concensus is that any chambered style muffler will restrict flow.
When I purchased my car it had this muffler on it. Actually it was the ATR pitbull. Had no idea this was a decent exhaust I was actually going to look into other optione. However I do like the sound of it