I'd pick the M2C any day, after driving the Supra last fall. Far more "practical", yet feels more raw in comparison. The Supra is quick and feels marginally faster from a dig, but the M2C is sharp and makes up for everything just from the first turn in and hard braking section.
It's all each drivers perspective they take home at the end of the day. For me, coming from a track focused F22, the M2C feels "soft" in it's stock clothing, but I don't let that discount the fact the BMW track day experience I had in the M2C showed me how well they bridged the gap between a base M2, and a better prepared "track" example for someone who does not want to modify their stock car for track duty (less tires/pads&fluid). The M2 should have been the M2C to begin with, imo
D