What will be your focus? Both BLT and Poly are fine choices. BLT will give you a more modern vibe and access to a good, not great, pool as well as an easy walk to MK and the monorail. The studios are among the smallest in inventory. Poly studios, I believe, are larger and have the unique feature of having a split bath. Plus, you have a bit more relaxed atmosphere (less hotel-like) and nicer pools. The monorail gives you quick access to MK, though not as quickly or easy as simply walking from BLT. Look at the activities each has to offer; look at their themes; look at their advantages/disadvantages. Decide which fits your wishes better. I like both, but if I had to choose with a 5-yr old, I'd likely do Poly.