Personally, I think the two units that you are looking at are fine as long as you check them out and look at maintenance records. We didn't want propane and wanted an all electric coach. You can boondock until your heart's desire as long as you have fuel.
I boondock with my RV group in Quartzsite every January for 4-7 days. As long as I have a full tank of fuel I could be there for quite a long time (two weeks for holding tanks/fresh water). Our coach requires that I run the genny 2 hrs. in the morning and 2 hrs. in the evening to keep the eight house batteries charged up which is perfect timing for breakfast and dinner. I also have one solar panel on the roof.
Our residential fridge has been perfect (Jenn Air). I wanted to use just one fuel (diesel) as we have the Aqua-Hot diesel system and a diesel genny. Since you have to use fuel anyway when boondocking (propane or diesel)... might as well just use one fuel. Electric/Propane fridges are very expensive to repair/replace.
You will have no problem boondocking in an all electric coach.
MM.