The Q4s make very poor use of their good amount of space, but nonetheless I like them very much, and they would always be my choice. Unless you are very unlucky you should get good service from your butler and in the restaurant, where they’ll probably know your names by dinner. It is August so there will be children, but, on the rare occasions they are visible, they will be sweet and well behaved.
Can’t make any comparisons, I’m afraid, but obviously the size of the ship will be a major difference.