[Z3guy]

^ don't get me wrong, for an everyday driver, M3/4s are still brilliant cars, easy to live with, and super practical. Yes, 911s are more expensive and less practical than a M cars, but what they do well, they do way better than M cars. Here is my take;

Practicality/Ease of Use: M3>911
Comfort: M3>911
Power: pretty much a draw
Steering: both pretty good, but 911 is a bit better
Handling: it is much easier to drive a M3 at the limit Vs 911. Much steeper learning curve to drive a 911 fast.

Chassis Dynamics: This is where the 911 destroys the M3. Quite franky, they don't play the same game. The M3 is very good, but is just way too soft, even the solid mounted rear subframe of a new M4. The 911 feels like a tank carved out of piece of billet aluminum. Most solid car I have every driven, better than most Ferraris and Lambos.

Traction: This is another area where the 911s are head and shoulders above M3s. You can get on the loud pedal much faster out of a turn compared to a M3. The way 911 lay down the power is orgasmic!

For the money, M3s are great value and awesome everyday cars, but from a performance standpoint, they are in a different league than 911s. Please note, my 911 comments are based off a 2015 991 GTS. The 991 was a huge leap forward compared to 997s.