First I guess is OP looking for older or new F250?There is absolutely nothing cheap about owning a diesel. The buy-in is a lot more, fuel costs more and maintenance is way more. You will have to drive a heck of a long way to get the costs of a diesel to equal gas in a new vehicle. Just wait until you have to replace your injector pump once. Ouch. The flip side is that nothing will touch the power of the diesel.
You really need to evaluate how you will use the truck to determine if you really need a diesel or even a three quarter ton. A properly equipped half ton is a lot less money and can tow a pretty significant amount. My 2016 1500 GMC with a towing package can tow 11,000 pounds really well. It is also a real pleasure to drive around town.
As far my son's 2001 F250 7.3 diesel, General maintenance has been very cheap other than turbo rebuild which isn't hard or big $$$. Yea diesel cost few $$$ to do oil change, more oil. I think towing anything decent weight, far out weighs oil cost. Exclude tires and brakes, both gas diesel same.
Diesel has glow plugs, go long time
Gas has injectors/ O2 sensors, don't last a long time.
Diesel fuel mileage towing or not much better than gas. Plus almost double the life.
Pickup acceleration, diesel is very torquey and think quicker.
How much abuse can a gas transmission take over time. The diesel designed for that purpose.
Now if looking at new diesel/gas, no experience there.
Best then to test drive each.
I just know having to pull out into traffic with a trailer or heavy load, diesel is awesome.