I’ve heard diesel is better.
I’d say they are great in warmer climates, considering their long life and reliability.
We own two diesels. Ours will not start unless the block heater is plugged in for a couple hours, where as a gas engine will likely take right off. Also we deal with two grades of fuel, #1 for winter which is too thin to properly lube the injector parts, and #2 which will gel in the winter. I ruined an injector on our Case tractor with #1, it stuck partially open and the engine knocked quite hard.
The oil well pumpers in our area used to use propane to run their Chevy or Ford pickups. Propane is so clean burning the oil always looked fresh and they got about twice the life out of the engines. Back then, in terms of engine life, the propane engines would last as long as the diesel.