I would say beyond what you have told us, you should decide based on how you plan to spend your time, how comfortable your mom is with the EVC on the bus, and how much you want to deal with split stays. Those are all personal choices that I don't think we can answer for you.
Many people are fine with loading a scooter on the bus, but some people would greatly prefer the convenience of being at the Boardwalk, still others find split stays not worthwhile. I happen to like split stays, but they are not for everyone. To make them work, we don't generally unpack. If your family likes to unpack, you might lose a fair amount of time to moving rooms.
If you do online check-in, and don't eat the hotel, you won't see much of the lobby holiday decor. If you wish to see decor plan to visit multiple hotels. Consider making dining plans at several hotels. POFQ pairs well with visiting Disney Springs.