None of the above.
Of the choices listed above, I've been on only one (N. Wind), back when she was fairly new, not yet stretched, and named Windward. She still has the best outdoor space of any ship I've cruised. The aft decks are the best, on both N. Wind and her sister ship N. Dream.
My favorite of the current NCL fleet is Norwegian Majesty. We're about to take our fourth cruise on this ship. There's something about her -- maybe it's her size, her great crew, the abundance of window seats on Deck 5, or the fact that she feels like a ship. Her small cabins don't bother us in the least, as they are laid out so well.
All-time, my favorite NCL ship is SS Norway. But I also have another special ship -- anybody remember Leeward?