You really need to figure out what you need for room type and what size contract you need. Like a PP mentioned you could stay in the same room type but it could require more points at one resort vs another.
A studio in May for 7 nights at SSR = 99/113 BRV/WL 120.
When you actually look at the yearly cost of MF between resorts there really isn't a hugh price difference.
So if you were comparing a 120 point SSR and WL contract (to cover your 7 nights at either resort in May) your MF would be:
SSR $672.84
BRV/WL $785.38
A difference of $112.54 - so there really isn't a hugh difference, yes it will go up each year, but both resorts will at a rate of typically 3-4%.
The biggest difference between the 2 resorts is the length of the contract. So that should be something else you factor in. Along with which resort you really want to be stuck at if you have to.
Really you are not lock in to
DVC, if at some point the cost of owning becomes a burden. There is and probably always will be a very strong resale market for DVC. It holds pretty good value, so even if you bought in and used it for a few trips over the next 10 years and then needed to sell, you could with making back a good amount of your buy in. That maybe where your difference on return would be -- if you hold on to your SSR contract for 10 years then sell -- it will still have 27 years left. In the same scenario - WL will only have 15 years left. Purely speculation, but my guess is that a longer contract life at that point will have a better resale price. So in that case of retained value for future resale you might want to consider SSR (possibly AKL for a longer contract but similar buy in and dues as WL).
Many factors go into a purchase, but you need to think long and hard about what your plans are for the next 10-15 years before you make any decisions.
In my situation we bought at AKV -- we factored in the length of the contract, what we could afford price per point and which we resort we could handle being stuck at. This is what led us to AKV -- we like WL, but the shorter contract was a drawback for us and our future plans.
You need to figure out what contract best fits your future plans.