Cummins all the way. Cheap to crank up also. One weak link is 5th gear in the 5 speeds. Upgrades are available though.
Powerstrokes are know for losing cam sensors. As in "over 50,000 miles, best to carry a spare." Also have their funny dual mass flywheel/clutch. Expensive to replace. And Fords door switches, look for dome lights on at stop lights. They have had issues with them.
