There will always be those on each side of this issue that are adamant that one or the other is the only way to go.
I have one foot in each realm. We have a new 2014 Tiffin Allegro gasser. I love our new motorhome. I love the floor plan. It is a big improvement over our 32 ft Class C. But of course that filled our needs 'then'. I researched the day lights out of gas vs diesel. If the price difference had been closer, we would have gone with diesel. I just couldn't see spending that much more for the diesel torque. Our current coach is fulfilling what we are doing these days.
But, we are already discussing that when we trade this coach in a few years, we think we would like to step up to a diesel.
I think if you have had a diesel, you may find yourself disappointed in the lower power of a gas engine. I fully understand wanting less coach to maneuver size wise. We don't plan to ever get a larger unit then our current 36 ft.