Originally Posted by Bradbury
If you're an experienced rally driver, then sure, activate DCT or even turn off DSC completely. Otherwise keep DCT off except for situation where you need to allow for more wheel spin. Driving on a snowy road at 40-50 mph is not one of these situations. If you however need to crawl up some slippery back road, then DCT can be of huge help, if not even a necessity.
Why would you not use the traction mode all the time on snow? In those conditions you will get better traction, and you still have stability control. My experience is that you need to take more risk to drive the same speed with full traction control enabled.