No comparison between the two, they are so different. Buy the M3 only if you are going to track the car and you don't care about anything else. If you want to have a much better engine with loads of torque from 1800 rpm and up, a much smoother ride, a better steering feel, loads more space, and a much nicer and refined interior - then buy the 550i. It is just so much more car for the money. On the other hand, if you are young and you haven't owned an M car yet, perhaps the M3 would be a much more satisfying choice for you. Ultimate performance around a track is so unimportant to me but perhaps this is something you really value. In the end, only you can decide what is best for you.
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