Yes, GP GXP.
I have more fun with cutting cookies in a RWD with Posi in the snow (LOL) but can say from driving hundreds of vehicles, the FWD really is much better traction in snow.
We just loaded two 80lb bags of salt in the rear of my son’s Camaro to get him some weight over the wheels so he can even move in the snow falling now.
See, the trick is to start with a RWD car with proper weight balance.
The Camaro starts out life weighing about 3500lbs and with about a 60/40 weight distribution, front/rear. That makes it about 1400lbs over the rear. Your GXP starts out with a 3600lb curb weight, and a 62/38 weight distribution, which means the front axles have 2232 pounds over them. Assuming the same tire, you would have to add about 768 pounds to the Camaro to make it have the same traction over the rear in snow.
My Series III (4550lbs, 52/48 weight dist) has about the same weight over its rear axle as you do over your front. Given the same tire, my Jag will have the same initial traction from rest as you do, but once the vehicle is moving, weight transfer will increase the Jag’s traction.
We get snow and ice here in Dallas, and it’s a great laugh to watch the FWD cars herk and jerk their way up slick hills, assuming they can make it, while the big steel cat just powers straight up them. :D