Kudos to you for doing the rental route before deciding on a purchase. The answer to your question, it depends. You didn't say how much you will be charged for generator hours.
Our dash air does great on the highway, not so good when idling. We run the generator when we start out, if the coach is too warm. If you are more patient (and frugal), you might just tolerate being too warm until the dash air does the job. It was the same with our previous 33' Class A. More space meant more help from the roof A/C.
For us, we would pay the charge for the generator as needed. Gas use is around a half gallon per hour, so not a big factor. Now if you are crossing Death Valley, you will likely need both.
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