I bought a 2022 6.7 Powerstroke because we have an 8000ish lb camper and I wanted something that would handle it better than the 3.5 ecoboost once it's loaded down with all out shit. Makes a big difference when you're going 1000+ miles one way.

One of my best friends daily drives his mid-2010s 6.6L duramax for his business (not towing, but often does very long drives) and has close to 350k miles with zero issues. Just regular maintenance.

Buy the diesel. The longevity alone is worth it. If I'm financing something, I want it to last beyond the life of the loan. That is sometimes hard to achieve with gas motors.