I agree with the previous poster who suggested calculating how much less per day and using that to decide if you really want to spend that much more for BC vs. YC.
FWIW, our last trip at YC (2016) left a sour taste in our mouth - this was pre-refurb so I can't speak to the new rooms, but the service was lackluster at best and after paying for 10 nights at YC I expected better than lackluster. The service level was great on our trips to AK (2007 & 2009), CR (2015), and FW (Cabins in 2017) - friendly, helpful, quick to resolve issues if we did have an issue (which I can only think we did with our door not completely closing and locking at our cabin along with the remote not working), and very welcoming. BC/BCV service has always been fine - not great, not terrible (2011, 2012, 2013). On our last trip to YC (2016) we felt like no one cared whether we were there or not. After our first night where neither of us could sleep (it kept sounding like a pump was clicking on and off it next to our room), my husband went down to the front desk to request a room change. First the front desk person claimed that we could not possibly be hearing any noise because she couldn't think of anything nearby that would cause the noise (it took us about 30 seconds to figure out that there was an ice maker nearby with a compressor that kept turning off and on) and then insinuated that we were just trying to upgrade for free to a lagoon view because my husband pointed at a room he thought we stayed at the last time. We were not trying to do that, of course, and I would have preferred to stay in the room since I had already unpacked everything for 10 nights! But I want to sleep more than packing and unpacking so we wanted to switch. Again we were shelling out for 10 nights there so we were very disappointed. Anyway, after that long story, we are very reluctant to return to YC again. However, one of the reasons we did like YC is because you get the benefits of BC like SAB and walkability to Epcot and DHS, but it is much quieter in the lobby and restaurants and we liked the food at the Ale and Compass, the bar and at the Captain's Grille (which I now know is a new restaurant).