For me it's a 50-50 thing. I think Chevy has the best powertrain, at least in the gas end. I would rather have the 6.0 V8 over the 5.4 V8 and the 8.1 V8 over the V10. I like the Allsion tranny, too, even though I have heard good things about the new Ford tranny. Diesels are close, but I think you can do more with the Powerstroke.
I like the soild front axle of the Ford. Easy to bulk up, good for plowing. I like the looks of both, but give the edge to the Chevy just because I like the overall size and shape.
Ideally, put a solid front axle on my Chevy and you have the ideal truck.