Car for car I like the M3 more.
The 1m Is just so much fun to drive though and the exclusivity is great.
To give you some perspective I was just out in Monterey, CA for autoweek. 458s are everywhere during that Wednesday-Sunday. Guess how many 1Ms I saw both driving around and at Shows...0.
If you have any questions PM me. My brother has the 1M. He's had it for almost a year so I've driven it extensively.