Like I said in the same title thread in the 1M forum, the M3 sounds better and in my opinion it sounds better even in its stock form compared to any turbocarged BMW with or without aftermarket exhausts. It is a gloriously sounding machine. The video also demonstrates the more agressive looks of the 1M, front end (or rear) the 1M looks better (read more sporty or aggressive, not necessarily elegant) imho. Both are wonderful cars to drive but with different characters, strengths and weaknesses.
By the way, some of our 1M owners have much better sounding exhausts including Akra Evo + down pipes. This particular one in the video was sounding "hollow".