What’s available to you locally? I would go that route. Someone that can provide service along with your purchase. Have you talked with your local electric company?
In central Arkansas we have natural gas abundant, but I want to go dual fuel since we are in the New Madrid, MO Seizmic Zone.
Father in law said to always have a diesel genset due to the fact that you can make your own diesel with vegetable sludge and the long life of diesel.
However, I am more apt to get a large propane tank for LPG since it is also abundant and servicable in central AR.