Ram, GM/Chevy or Ford
Don't buy a diesel unless you need one
Why is that? Whats not to benefit from heavy duty components, longevity of a diesel engine, a turbo, ability to hook to almost any trailer thats not meant for a Semi, having an engine or exhaust brake, and fuel economy? Diesel engines can produce tons of power with simple bolt on mods. (More gains per component) than a gas engine. And now, diesels are coming as an option in half tons.
What I said if you don't NEED one. A lot buy them to be cool. If you need one you need one. I see too many people at my buddy's shop crying when it's time to fix them.
Completely depends on year and model/engine.
Ask a Ford Tech why they love 6.0/6.7 so much...
I work on diesel every day and would recommend a Cummins all day long.
Ford is the only U.S. automaker not on welfare. Ford gets my vote.