at that time, i was deciding about the rs5 and the m3. because there was that heavy rumor that the rs5 was going to make it here in the us in the summer of 2011. but after seeing it in action in europe, i decided to get an m3. but i digress.
My family and i looked at pictures and videos of the two cars and almost unanimously agreed on the m3. and after i came back from london, I went straight to the dealer with my family and ordered it in 20 mins. Took delievery on the 29th of july. and i'm glad i went with the m3.
so to answer your question, the latter