Yes, a gas engine chassis will be $40k or so less expensive than a diesel pusher. Both decent coaches - it just depends on what you want and your ability to pay for it.
Basically you are asking the old "gas or diesel?" question, which has been argued pro and con here numerous times. May I suggest using SEARCH to read some of the previous discussions?
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL