I had two older Class A motorhomes in the past so I'll throw in my 2 cents worth.
Class A motorhomes are a great way to travel. You get an exceptional view and they are easy to park. When you pull over to rest you are able to remain in the comfort of air conditioning, can walk around, sit down and have lunch and you never have to use nasty public restrooms or a hot one in the trailer! You're never in a hurry in a motorhome so it is very relaxing.
There are some things about Class A motorhomes that make them undesirable such as they are typically built with the same quality as travel trailers, and there are few craftsmen in the business. They usually have pretty crappy dash boards and those big windshields can be problematic. Sometimes the opening might be cut to big or the structure can have enough flex to pop out a corner. Some come with oddball headlamp lenses and taillights that might leave you in deep voodoo 10 years down the road trying to find a replacement. Several years ago there was a model so overbuilt it only had about 850lbs cargo capacity but it looked nice and shinny.
Service can be a pain too as often certain things are not where they should be and access to parts has been restricted by the way the coachmaker built it, in spite of the chassis maker's build guidelines. Sometimes there will be an oddball part nobody can find in the books. I had a Ford dealer partsman who told me Ford didn't make my chassis, an E33. The other dealer in town had no problem locating the parts I needed.
For all those reasons the Class C motorhomes are a better choice because you get auto manufacturer quailty on the dash, cab structure and service access. Parts jockeys are not nearly as confused when you have a Class C as when you say you're looking for a part for an E33 chassis or a P30, F53 or a Workhorse whatever.
It can cause sleepless nights when trying to sort out a problem with a dead Class A in the driveway because you toss and turn thinking about big wreckers, cracking fiberglass front caps, and the rear end dragging while on the hook. Luckily for me I never had to have one towed but I had the sleepless nights thinking about it before finding the problem.
After all this rambling I say the motorhome for comfort traveling, but the 5er will give you more room and peace of mind.