if your accord is scraping, then the 335 will be plowing the road.
As far as getting stuck is it an issue of traction or the snow level being too high? An AWD car with a good set of winter tires on it should be able to handle most situations. The only issue for you may be the ground clearance.
I don't think the m performance package (dynamic handling package as some refer to in the US) changes the ground clearance compared to the stock 335 (comes stock with m sport body styling).
if it is an option keep the accord for the winters and 335 for the 2 months of summer you guys get
