We've done both and I am glad we did the MK BBB when my girls were younger and were more into princesses. The DS location is nice and has more room and the fairy godmother magic mirror, but overall, it has a different feel. I'd just see what works best for the schedule. We did the the BBB at MK when we knew we needed a little down time midday. We did DS BBB before a dinner reservation so the girls would be dressed up for their character meal. And you may already know this but you can bring your own dresses. You don't have to buy the parks princess attire.Getting close to reservation day.... Which do you prefer- BBB at MK or DS and why? I'm not concerned about convenience, I want the best experience for my kiddo, this is likely the only time we'll do this. TIA!