I will chime in on this...
I had a 2002 F-250. It was the 2 valve 5.4L and the one your looking at is the 3 valve, it is supposed to be better, but, mine was a GAS HOG! I got 13.1mpg ONCE in 2 years. My average was around 11-12. I hate Ford automatics also, they shift like crap. Sluggish to downshift, yada, yada.
I do plan on getting another f-250 someday, it will be a PSD, and a 6-speed. The frame/suspension/chassis on my f-250 was top notch. Very beefy and performed well.
At work, we have both a 2001 2500 (2wd automatic) and a 2005 2500HD (4wd automatic) Both trucks are used for hauling...I work for a RV dealer. Both trucks have made hundreds of trips from Columbus to Elkhart to pick up new RV's. Both trucks still run great. Nothing has been done to the transmission, rearends, engines, etc. They both have the 6.0L. The 2005 is the one I drive the most, it plows snow great, the 4WD seems to grip extremely well for plowing. It has over 128K on it with original brakes...yeah, I know, it tows trailers day in and day out and still has the OEM brakes. All that's been changed is the oil, tires, and the instrument cluster.
So, I vote for the chevy...sorry guys.