My dad loves his gassers; he likes to "let them work" in the high rpm range and putt up the hills. "I'm not in a hurry" and "I'll get there when I get there" are his favorite sayings. Not me.
Me, 5 minutes into the drive listening to a gasser wind while I'm getting passed by every other car on the road and I'm ready to shoot myself. I just love the way modern diesel GM trucks drive, loaded or unloaded, and especially loaded heavy. I tow a 20k fiver, a 14k dump trailer, 14k flat bed, and anything else I want to tow with the diesel. And I like to get where I'm going and love doing it. You can pry my diesel out of my cold dead hand. I got my boy a baby Duramax 1/2 ton to tow our ski boat when I have the 5th wheel and I love driving the 1/2 ton diesel as well. My wife has a 6.2L in her Escalade, and it's a great engine, but if I had to do it over again, it would have the 3.0L diesel.
Bottom line is you can get away with a gasser for your application but, IMO, no thanks. But it all comes down to personal preference and what can you tolerate and what you can afford. If you can afford it, and simply prefer the way a diesel drives, splurge and treat yourself, IMO.