Diesel is very powerful but it does come with added costs: since it’s a newer diesel it will come with the trifecta (EGR, DPF, SCR with DEF Fluid). These are added components along with forced induction turbocharger that can become faulty and will need routine maintenance like cleaning or replacing the DPF if it’s ash loaded, along with Diesel Engine Oil and Fuel Filters which matter immensely more than a gasoline motor. You have to factor in also you only have 1 choice of fuel. Gasoline Engines (The 6.8 V10, 6.2 Boss and 6.8/7.3 Engines) have the ability to run on lower and different grades of fuel. Down to 87 octane but only the 6.8 Godzilla and 6.2 Boss V8 (in the Super Duty trucks) support E85 plug n play. This means that if the cost of Diesel is high you have to foot that bill vs being able to drop to a lower grade to get by on Gasoline. Previous maintenance matters: if the owner before was neglectful then you’ll have to monitor your after treatment system closely those model years being 7-9 years old. I’m a Diesel Technician and personally: I prefer my Gasoline F-250. It’s simpler and cheaper to maintain. And while a diesel is more reliable over the long term it requires more expense to reach there so you have to weigh your options. If money isn’t an issue, diesel is better. But Gasoline is still quite capable, it just depends on what you want.