The THV are one of the most unique stays you'll have at a
DVC resort, there is nothing like them. I really enjoyed the remote location, but it was remote, if you want to be in the middle of the action this is not the place to be. However if you are looking for a great place to stay with your family close by and the ability to bond during meals (ie you have your own BBQ grill), it's awesome. You have lots of your own space (patio and BBQ) plus you are pretty isolated in your own treehouse.
If you want to go to the parks a lot and want nightlife then you are better off if you can get BWV. Also the rooms at BWV are more typical of DVC rooms than what you'll find at THV. For your first stay you should decide what it is you want to do and plan by that. If you want to go to Epcot and & DHS then stay at BWV, if you want to enjoy the time with your family, cook meals in the room and hit a few parks, keep your ressie at the THV.
Keep in mind that to get to parks from THV you will need to take a bus to the Grandstand and transfer to another bus, or you can opt to walk to the Grandstand and then get the bus. Either way it's not simple to get to the parks, if you are looking for park accesibility stay elsewhere.
What you need to decide is whether or not the novelty of your accomodations is more important or the proximity to the parks.