personally, i would wait and see what comes out, chances of either truck being sold in that week is slim.
personally i love my GMC, which is an 03, and my gf's 2011 is even nicer, Her truck i can get 22 mpg highway, its quick, rides smooth. I rode in a 2011 dodge, ran good, didnt get as good of mileage, and just felt bouncy to me.
I do not like the fords strictly because of the gas mileage, the only way you can get decent mpg's is the ecoboost which is an expensive option, and it doesnt have the torque of the v8.
i would wait and see what the new GM body style is going to be