NO one has mentioned the trade-in value boost for having the diesel genset.
Like it or not, the general view out there among shoppers is that the LP genset was a downgrade. I don't have a dog in the fight - yet. We have a gasser with gas Onan 4000. We love it, but when we finally locate that reasonably priced Winnebago Journey/Itasca Meridian 32T, I will be looking for the diesel generator.
We have the 2020 Navion and ordered it with the diesel generator, which is a little noisier than the propane but has the benefit of using the Sprinter fuel tank.
The Sprinter AC is good but NOT enough to cool the whole coach on hot days.
Of course if you're at a State Park or similar you will be using their 10 volt AC to run the coach AC (can't run the generator at night during quite hours).
RickoJ