As someone that owns trucks and cars well into 200,000 plus miles resale is something I never consider. What I do consider is performance that matches my needs. I travel in the mountains, I tow horse trailers, and I tow in the heat and cold. I have seen too many gas powered trucks overheated on steep grades with loads, Not many diesels. A diesel generates very little heat at very low speeds and you can crawl up winding mt passes with the AC on with little worry. My truck does not smoke or stink. The maintenance on it is low I have only replaced things that have reached their normal lifespan with just a few exceptions. I can't imagine every wanting a gas engine pickup unless I was going to spend my time on the flats. On my last trip we went from San Francisco to Los Angeles without stopping for fuel with my Lance in the bed.
That said: buy what ever works for you , making sure it is the right tool for the job.