The middle two on deck 10 offer a little more privacy on the balcony with the bridge overhead. Keep in mind you need to keep the door closed and curtains closed at night so they can see clearly from the bridge. This true for all the deck 10 ACs and may be for deck 9 as well.
Yes it can be windy when at sea but it depends on wind direction. With the steel bulkhead you can layout on the lounger and be protected from the wind.
The giant balcony is a great spot coming and going from port.