I have had a F250 1996 with a 460 motor auto tranny, and it was sweet. It was a solid truck and never left me. I traded it when it had 150,000 miles on it and very little was done to it and still running solid. I only traded it because we couldn't pass a gas station, it SUCKED the gas!! I think hauling, it was in the 5mpg range.
I have a 2001 F250 7.3L diesel, manual tranny. Its a sweet truck. Its been solid, have had some repairs to it, but it has 130,000 miles on it now.
The newer fords with the 6L diesel are not getting good press. They are having problems with them, such as poor gas mileage and not as much power as mine. I am hanging onto mine, its a good motor, good transmission, at least thats what the mechanic tells me.
I have owned chevys, but it was the 6.2L diesel I believe, they aren't making that motor anymore, thank God. It was a junk truck, never had so many problems in my life and so many mechanics that couldn't diagnose problems off it.