Imagine doing normal things like cooking, sleeping, showering, using the bathroom, etc...in each (imagine being stuck inside for a couple rainy days). Then let the layout you like better decide.
I wouldn't count on quality to be much different. All the appliances and fixtures tend to be universal among all the brands.
Also, not a chance would I count on the solar/battery package running the air/con. Sure it may start it up but it won't run it long enough to be worth the hassle. Solar/battery systems are for dry camping when you have minimal electrical needs. Air/Con is easily the highest power demand of any RV system.