Better? Too subjective. Better how? Better ride (chevy). Better mileage (chevy). More comfortable interior (Ford). More reliable (either, both these engines have been around for a while). Better looking (this question may just start a fight).
But, if you are just talking about which one will haul more, then I would say move up a truck size. If you plan on towing 5000 lbs, a 1/2 ton is fine. If you are worried that the 1/2 ton has a tow rating of 8500 lbs, and that is just about what you are going to tow, then get a bigger truck. Chevy, Ford, Dodge, and even the Tundra are all nice trucks in the half ton models. I just can't see a huge difference in abilities between all four of them.
I own a Ford. But if it was me, I would get the chevy. I love that 5.3L engine. However, a hemi might be nice.....