The only other difference I can discern is that there are fewer cabins on deck 7 than on 6. Deck 6 six has inside rooms for pretty much the entire length of the ship. More cabins means more traffic means more noise.
I personally like deck 7, but usually book a category 7 room. The prices for those are the same regarless of deck.
GET UP TO A $1000 SHIPBOARD CREDIT AND AN EXCLUSIVE GIFT!
If you make your Disney Cruise Line reservation with Dreams Unlimited Travel you’ll receive these incredible shipboard credits to spend on your cruise!