We need to specifiy. Are we talking diesel or gas?
Diesel motor wise Cummins is the best which BTW Dodge does not "own" cummins is their own company, Ford puts the 8.6L cummins in their 650's. Also in 2011 Ford is comming out with their OWN motor a 6.4L that is supposed to replace the Powerstroke because Navistar (who built the powerstoke) and Ford's contract was torn up. Ford has the BEST diesel motors "powerstroke" from 1994-2003. From 2003 up they have been having computer related problems. Also the Tritan V-10's have been catching fire. (Which is a gas truck). I think the very best motor of all time was the 7.4L Powerstoke, it held up threw anything and you could put 300k + miles and it still would run lke a charm. Too bad they don't make them anymore. Chevy is too expensive in general. They have decent motors but they are expensive to buy, to fix, to modify.
Body wise. Dodge is crap, they fall appart and rust away. I have a 93 Ford that only has a few rust spots. If it was a Dodge my feet would be going threw the floor. Chevy is already but they can't take as much pounding as a Ford. Plus I personally think Chevy's are ugly ;]
I like Ford. Always have, always will