We have a Champion 1500 duel fuel which we have only run on propane. Mainly it's nice not to ever get gasoline on your hands, clothes, etc. and you don't have to carry a gas can. You also can get longer run times (bigger fuel tank). They are however downrated when operating on propane but the 1500 still operates our Dometic 1100 AC just fine. That said we haven't ever camped where it has been hot enough to need the AC so I have only run it for several hours here at home to test it.
We really bought it for backup power for our house, our power here is very reliable but you never know, and secondarily for backup power for our Escape. The Honda is I'm sure a better unit and more repairable but we don't anticipate running it much so we went with the less expensive Champion, and also for the duel fuel option.