On the road now in Canada and had a campground conversation with a newbie A owner on this topic in Maine the other evening. After 40+ years of owning 4 A's and now a Chevy B+, I found myself saying I would not own another A.
Our 2-slide 30' B+ offers all the space a couple needs while being considerably easier and less tiring to drive at just under 8' wide. Other benefits include: my wife can/will drive the B+, but not a wider A. B+ cab is solid, has 2 doors, a surprisingly powerful ice-cold A/C, 2 air bags, and all of its equipment is Chevy, not a collection of mediocre mfrs. we'd found in our A's. 16" tires are less expensive and readily available. Carrying capacity is all we need. Never have been turned away for service as we had been in our A's. Most Chevy dealers welcome us. A's often need heavier duty garages. Gas mileage is as much as 10 MPG. Braking is excellent. Noise level and cab comfort very good. More maneuverable turning ratio. Smaller, though adequate tanks. Engine servicing outside, not by lifting a clumsy internal canopy.
I'd say - drive both and choose the best fit for you. Best of luck.