I never made a request one way or the other, but I prefer the wooden balcony. You have more privacy and if the weather is bad you are covered. I appreciated it in 2002 when we had 24 hour heavy rains twice, could still sit out.
I always request the open balconies. I've been doing so for the last two or three visits, and have had that request honored. I had closed balcony once and HATED it. It made the room so dark.
there are also 4 balconies on the boardwalk that are solid right up to about 4ft or so. i know because unfortunately we got one on our first trip home this past summer i was disappointed to say the least.
we were in room 5013...in this photo it's the top floor, second balcony from the right.