You are either in the market to spend DP money or you aren't. Pretty simple. Unless you NEED 43 or 45 ft to get the floor plan you want and you want to spend that kind of money to get it there isn't much reason to look at DPs. Gasser will do just fine.
The maintenance on a DP vs a gass unit isn't even a consideration IMO when the cost to buy is so much higher.
While you will never have the CCC or ride comfort of a DP in a gas unit the price to step up is considerable for what you pay. Not really worth it unless you need that CCC or length for the floor plan and have the money to burn on it.
Floor plans have gotten much better over the years. Gas units have gotten better. The difference isn't what is used to be.