I was surprised at how much grip my 335i had, considering it's just rear wheel drive. I only have the BMW PPK on it, but still - I can get out of the hole pretty quickly with minimal wheel spin. Heck, a MK6 GTI that I had would violently spin in 1st gear. The BMW, with more power, has so much more grip.
Now, obviously the AWD has a bit more grip and even less wheel spin, but overall I think RWD is better because it allows the car to be a bit more flexible, lighter, etc.