Honestly, I don't think that there is much of a difference. We always preferred the AK location because you could make a reservation. Now, I believe I read that you can do the same at DD location.
That being said, the DD always seems incredibly packed, and while I like the atmosphere a little better, there is still the possiblity during the busiest times that you'll be sitting out on their deck...which is fine, but it definitely lacks the atmosphere.
RyMickey