In my opinion BLT is better for families with younger children and BCV is better with older children.
I prefer BCV when staying in November since we would be walking distance to Epcot! Food and Wine Festival.
BLT:
Pros-
1. Closest hotel to Magic Kingdom. You can literally walk everyday if you wanted.
2. Room decor (this is personal preference). I like the contemporary vs the beach style
3. View of fireworks from the balcony
4. Watching the castle while laying in bed. (love the magic kingdom views)
5. Monorail. Love being on the monorail system. easy access to epcot, grand floridian and polynesian
Cons-
1. balcony: to me if you are in a high floor room the view is fantastic, but I was always nervous of the little ones being able to walk out there.
2. wear and tear. Some of the rooms seem like they need to be spruced from all the nicks and cracks.
3. pool. probably the worst pool in all of the
DVC. The main pool at the contemporary is very boring and old.
BCV:
Pros-
1. BEST pool in disney (my family's opinion)
2. walking distance to Epcot!
3. Just a boat ride to Hollywood Studios
4. Beaches and Cream. Kitchen sink!!! all I have to say
5. Location to Boardwalk and Epcot food
6. Did I say the best pool yet. It deserves a second mentioning in my family's eyes.
Cons-
1. Decor. Being on the east coast I see a lot of beach houses so this is boring to us
2. Smaller resort. Rooms can be difficult to get
3. View. There really isn't a good view from most rooms. (Not in my opinion)
Both are great and we love staying at each. Depends on the time of year, what is happening and who we are taking. Enjoy!