I think you are young enough that the higher cost of the diesel will be okay. If you were late 60's then I would go with a gasser.
Are you thinking pre DEF rig? I would think that. You know diesels so you are a leg up on that part.
You are theoretically safer power train wise buying a used diesel. 100000 miles on a good Cummins diesel Vs 100000 miles on a gasser.
But if you do not plan to keep the rig long then GASSER wins
It should be about the floor plan and the features you want on the rig more than the engine that gets you there.
Now that is clear as mud ain't it
