ML is right. It all depends upon how much time you will spend on your balcony and how many people you plan on having out there at any given time. Since the wrap around balcony cabins only hold two people (my parents were in 6452 on the Glory), there were never more than three of us out there at any given time and the extra balcony wasn't really needed. They did however like it because they could see from two sides of the ship (Aft and Starboard or Port).
For a savings of $300, I would stick with a true aft balcony.