We like to be close to parks that we most often end the evening at (MK and Epcot). At the end of a long day, a short commute back to the resort is awesome. PVB wins over AKV hands down for post-fireworks exit. If you "rope drop the exit", you can jump on the first monorail out that's usually waiting on the platform. Alternately, get on a ferry (huge capacity), take lovely photos while waiting the short 5-10 minutes or so for it to fill, and you're back at the TTC in no time. From the
DVC longhouses, TTC and the main lobby are almost the same walking distance.
For room configuration, our preference is 2BR>2 connecting studios>1BR. With the vast majority of PVB studios connecting, I consider the chance of not getting connecting studios negligible. Even if it did happen for 1-2 nights, it's not a disaster. I imaging 1BRs would work very well for families with 1 child that sleeps in the murphy, leaving the fold-out bed closed. With more than 2 children overflowing everywhere, we prefer to have the extra bathrooms and beds over the washer/dryer.
We bought three contracts (PVB, BLT, VGF) before our first visit to WDW. No regret, super happy with them!
If you're simply looking for a nice room in prime location, you're pretty safe making a decision without having actually stayed at a resort. Distance by Googlemap and available travel options are objective facts. Theming, room configuration and amenities depend on personal taste and your family's needs. If they are important to you, you should probably at least walk through the resorts before making your purchase decision. With the stock market corrections, resales prices are likely to drop. There is no hurry to buy.
Good luck with your decision!