I was in a one bedroom lake view villa at BLT from 8/4-8/14. I really liked the resort. Although they had a few issues to iron out due to checking in on opening day, by the time I checked out everything was running very well. I really liked all the landscaping in the courtyard between the tower and the pool - they had lots of outdoor seating to just relax and soak it all in. Having two elevator banks really helped - I was never in a crowded elevator and they came fast too. It was a very short walk to the CR bus stop - it seemed shorter than the walk across the sky bridge to the 4th floor actually. The sky bridge was very convenient for accessing the shops, restaurants and monorail.
I loved the room itself. I liked the big windows in the living room area - it made it nice and bright. I liked the separate tile shower in the master bath, since I really don't like showering in a tub combo. I did try out the jacuzzi tub though, and it was great after a long day in the parks. It was nice to have the second bathroom, even on a solo trip - and I'm sure it would be really appreciated by families. I also liked having the washer/dryer in the room - lots of laundry during the August heat. The flat TV's had an excellent picture, and it's nice to have the DVD player since Disney's TV programming leaves a lot to be desired (and that's property wide, not just BLT).
Personally, I liked the decor. It's very streamlined and modern looking - which doesn't appeal to everyone, but if you've seen pictures and like it, it's even better in person. I also liked that you had to use your room key to access the building. I imagine that a few non guests managed to sneak in behind someone with a key - just being realistic here - but I didn't see any people just wandering around.
You would have to weigh the club level amenities and location of YC against the extra space and amenities of a one bedroom
DVC unit and the location of BLT to see which would work best for you. But if it were me, I'd stick with BLT.