Are you going to have your own vehicle? I would not stay at THV without my own car. We had the villa 4 in from the entrance and it was a long walk to everything-the pool, the store, the bus stop, etc.
How many adults vs children? THV gives you 3 bedrooms but one has very small bunk beds that wouldn't fit adults well. Also, THV only has 2 bathrooms--the over gorgeous master bathroom that is inside the master bedroom and a very disappointing small bathroom that the other people share.
Are you planning to spend a lot of time at your resort? THV has a private charcoal barbeque and a huge deck for outdoor dining. We had terrible mosquito problems when we stayed there (May visit) but the outside area at these villas is the best of any
DVC resort in my opinion.
So, depending on the configuration of your group and whether or not you have a car, I'd pick THV if you are doing a lot of resort time and I'd pick BLT if you are doing a lot of park time.
I have owned DVC for 16 years and have stayed at all of the resorts and the THV are my least favorite because they are so remote. If I want to rent a cabin, I can do that an hour from home and it was the same type of experience for us. The treehouses are stunningly decorated but just more remote than we enjoy for a Disney vacation.