With the West Village renovation pretty much complete, all the units should be pretty nice. Some are farther from everything than others, but that will always be an issue with a large resort.
As for which units are best, it depends on what you like. You also might not have much choice - RCI is designating the different villages on confirmations now, and OLCC might insist on puting you in the village your exchange came from. Since it is not an RCI exchange, you are most likely to be in the exact unit that was traded, unless it is not available. Dial-an-exchange should be able to tell you the unit number. The lowest numbers are in West Village, then North Village, East Village, and finally River Island.
Just to contrast, River Island are the newest units, but they are in 10-story buildings surrounding the River Island pool complex. While I'm sure it's nice, I'm also sure it will be a busy area, with kids running around, another unit above or below you, or most likely both. Unless you're on a low floor, you'll be waiting for the elevators... West Village is the older units, mostly Golf Villas, spread around the Golf Courses. They were recently renovated to like-new condition, but were designed (25 years ago) with smaller bathrooms, so only so much could be done with the remodel. But most of these are in clusters of 4 units, with 2 parking spaces in front of each unit. I would prefer these over River Island, while some would prefer River Island. Either way, you have access to all the amenities in each area.