I have to think about this vote. Their is something to be said for all, just depends on what mode I'm in?
ITA. We have stayed at all of them except for WL, and we'll finally be checking that off the list at Christmastime this year (split stay between WL & BC).
I think so much of it for us depends on the purpose of our trip, who's going with us, and how old everyone is.
When D was very little and we spent most of our time at MK, we hands down preferred the Poly because of the ease of transportation to and from MK and EP (where H and I love the food options).
Once she got a little older but still preferred the MK, our favorite was the GF for a while. We also stayed in a to-die-for 1BR villa in BLT with a theme park view...and that was absolutely incredible.
But once she was old enough that she was all about Star Wars, thrill rides, and eating delicious food (by age 10 or so), we spent more and more time at HS and Epcot, so the Epcot resorts became our thing because, for us, you can't beat being able to walk to two parks. And we actually love all 3 EP resorts, so we typically just book whichever one has the best available rate.
But...if H and I were to go alone on a trip where we wanted to spend as much time at the hotel as at the parks, and it were a less busy time of year, we would very likely choose AKL. I love the theming, the food, the vibe...everything but the fact that the only transportation option is buses, which is why we've only stayed there once.
But since I had to vote...I chose the BWI, because we stayed in a Garden Room on an adults only trip in April and it was absolute heaven.