I started towing with gas switched to diesel, worlds better. No contest. And in 10 yrs, I’ve spent $3500 on maintenance / repairs, which is pretty darn good in my opinion, cheaper to own than any gasser I had. Oil changes cost the same as the 2015 Silverado 1500 I drive at work bc the Silverado requires synthetic.
That said, it’s a 2001 7. 3L F250, so yes, the holy grail. Simple, 2WD for max tow capacity & it. Just. Works. It’s my daily driver & gets 22 mpg.
I am not a fan of any of the newer diesels - well really any new trucks (why does everything have to be enormous sheesh, unnecessary). All these computer modules & DPF/DEF have just killed them & prices are ludicrous.
I philosophically oppose new vehicle purchases, I think it’s a terrible investment, but everyone is different. If I had to buy a new truck (someone forced me & then left a sack of money on my porch), I’d have to think pretty hard. Repairs on everything newer is going to be expensive bc of all said computers & sensors, it’s crazy what we pay on the work trucks.
For OP tho, if it’s going to sit, I’d recommend gas no question. Diesels need to move, they just don’t store well.