This is a completely subjective thing that you will need to answer yourselves.
We chose our first purchase to be AKV because we absolutely loved the look and theme of the resort, and the SV rooms are just icing on the cake.
Our other purchase was VWL and we did this for 11 month priority for Christmas time because the lodge is amazing for the holidays. It is also only a boat ride away from the MK and Fort Wilderness. It is a small resort, so without 11 month priority, you prolly won't get in there without ownership in Dec or peak periods.
The other resorts have their own special features too.
OKW- another one of my favorites are the largest rooms, and lowest point values. We seriously considered buying 200 pts here instead of 150 pts at WL. Great location with a boat to SSR and DTD.Very relaxing. Loved the balcony. This is also one of the cheapest ones per point.
Beach Club is one of the smallest resorts, and hard to get into during peak times. Has a great pool area Stormalong Bay, and is walking distance to Epcot and DHS.
Boardwalk also is walking distance to epcot and DHS and has all the excitement of the boardwalk area.
SSR is the largest I believe so has lots of availability. Walking distance to DTD. We enjoyed our time here, but wasn't crazy about the rooms, JMHO. We are from NY so was disappointed in the theming, just didn't feel like Saratoga to us. Maybe they need some live horses!
You could also go with HH or VB, but then you would only make your ressies 7 months in advance.
Hope this helps.