This is a great topic! And simply balcony vs inside does not take in what we really investigate when booking, and that is location of the room.
As some have said, balcony cabins can be larger. But this is not always true. Careful research can uncover unusually large inside cabins - we love the insides on Holland that include corner couches!
As far as location, we avoid embarkation floors, especially on port intensive sailings as your hallway can get clogged with queues of folks waiting to get off the ship. Along with making it difficult to get out of your own room, it can be noisy.
We also avoid close proximity to elevators & restrooms and we try to be sandwiched between two "cabin-only" floors.
I like to be mid-ship, (up, down & bow, aft). I find it more convenient to get to everything.
Another plus for the Balcony side of the spreadsheet is watching the ship dock. We frequently travel with another couple and the husband loves to watch the ship dock, which is generally very early in the morning. So a balcony and lots of room service coffee is his nom.