A big factor here is how you plan to use it. THe red and blue a proven with a solid track record. The Champions are also proving a good economical choice.
If it is critical that the genset do its job. Than stick with a proven model.
If it is not critical than you may gamble with some of the cheaper models.
I imagine all the units will recharge batteries however on a 90º day will your trip be ruined if the genset can't start the A/C?
That is the gamble you are taking.
If the generator is not mission critical try it out. But if you require a working genset to get the job done why gamble?