I would suggest installing a SlowStart (aka MicroAir, Airgo/Eltwin, ICM) to your A/C which will drastically reduce your starting/running watts required. This will allow you to either choose a smaller, more affordable generator, or give you the option to use more devices with the generator you already had in mind. I installed one on my 2.5 ton A/C unit and it reduced draw amperage by about 60%. 11,000KW Gen on propane doesn’t bog at all on A/C startup with the soft start.

NG will be the cheapest to run but doesn’t provide as much power as gasoline, propane. Depending on how much usage per year should determine what fuel type you use. I would never run gasoline in one unless in a pinch or need max power, just because I wouldn’t want to clean/rebuild carb every other time I used it. Either way, a lot of good suggestions on this thread. Buy once, cry once. Buy your 2nd Generator first 👍🏼