RS4 would be a more fun and practical car.

First of all, due to its turbocharged engine, in the city, 0-30MPH would be a complete beast.

Second of all, having AWD will make your car still drivable in bad weather and the winter.

The final argument is that I personally have a weakness for Audi's RS creations. They are just so under-stated, yet so fast!!! And all of this without funny fish gills on the side, like the M3 has.

__________________
2008 ML320 CDI | Iridium Silver | Black ARTICO Leather | Premium Package (H/K Logic7, Parktronic, Rear Heated Seats, Rear Power Hatch, DVD Nav, 10-way Front Seats w/ Memory) | Backup Camera | Aluminum Running Boards | 4500K MTEC Low-beam HID | 30% Metallic Tint | Boomerang2 Recovery System | Weathertech Front Floorliners | Bridgestone Blizzak DM-V1 Winter Tires