I live in Michigan and just got a 2015 M235i RWD last October. Like you, I'm doing dedicated winter/summer tires but was worried about how RWD would do in the slippery slush and snow. After a month of driving in this stuff I'm no longer worried, and am very happy to have gotten RWD. Not that xDrive would be bad, cause honestly I don't know, but I certainly don't feel like I'm missing out on anything. With DSC on (default mode) I have great traction and confidence that I can get the car to go where I point it. Then by enabling DTC I can get a little bit more wheel spin and the rear end slides out for the fun snow fish tails, and then with DSC off I can get the car twirling like a top (in parking lots of course). Would consider xDrive next time just to have a different experience, but very pleased so far with no regrets on drive configuration.
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