I have owned two Dodge hemis, one 6.0L vortec, 3 5.4L Fords. I am a ford person to the core, but out of these options I would have to pick the 6.0L GM engine for a gasser.
For me a gas engine is a gas engine once you put a trailer behind it they are all turds.
For a diesel its another story...3 6.0L powerstrokes, 2 Duramaxs. One day I would like to own a cummins.