I look at it like this.... remembering first that Mxdrive isn't a bolt on get me home in the snow haldex system it is a sophisticated traction enhancement tool with electronic diffs center and rear that is so deeply integrated into the traction management system it essentially is the traction management system
Pros:
-awd will be faster off the line
-awd will be better in inclement weather
-awd will likely deliver faster laptimes on the majority of racetracks (maybe all tracks)
Cons:
-awd will not have the same traditional feel as rwd,
-awd will be slightly slower in a high speed rolling race due to more rotating mass
Considering that no ones paychecks are on line for laptimes in a stock M3, when purchasing it comes down to what factor drives personal enjoyment on the track or favorite backroad
Personally, rwd feel isn't high on my priority list,
I like the more "artificial" feel of an awd car shifting power forward to maximize traction. so I will easily take the faster car that has as a side benefit better all weather performance. That said, I don't think AWD is a "better" choice. For those who love rwd feel, nothing can replace it and rwd with proper tires is obviously capable of managing inclement conditions
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