I can't speak to price difference on the two trucks because I haven't priced the F350's, but I do know that with the right packages, 10000 GVWR, camper package, and FX4, a F250 is the same as a F350, just a different badge. As far as the 6.2 vs 7.3 gas engines go, I've pulled a lot of different trailers, with a lot of different trucks over the years, and I've never wished that I had a smaller engine. I'm waiting on a 2022 F250 with the 7.3. My current trailer puller is a '98 Dodge 24 valve Cummins. I don't expect to be disappointed with the new truck, and won't pay $10000.00 plus for another diesel because I don't need it anymore. My opinion, your mileage may vary.