The pros and cons of each Orlando DVC resort, from my point of view:
Animal Kingdom Villas - Savannas, convenient parking, slightly larger units, very nice pool, further from parks other than AK
Bay Lake Towers - Walk to MK, newest, slightly larger units
Beach Club Villas - Awesome pool, walk to Epcot, walk or boat to HS, small units
Boardvalk Villas - Boardwalk, walk to Epcot, boat/walk to HS, small units
Old Key West - Largest units, not as close to the parks, convenient parking.
Saratoga Springs - Least themed, only spa, convenient parking, small units
Wilderness Lodge - Boat to MK, small units
In a large part, it comes down to location, theme and unit size.
BCV and BWV are in the Epcot/HS area and are very popular because of that. BLT and VWL are in the MK area. The other three are more distant from most of the resorts. OKW and SSR are in the Downtown Disney area.
The themes are really a personal preference. AKV is probably the most unique to me, with the savannas. VWL and OKW (and perhaps SSR) feel the most laid back. BWV is probably the most lively and the boardwalk theme is fun.
OKW is the largest of the DVC timeshares. BCV, BWV, VWL and SSR are the smallest. AKV and BLT are a little bigger, but still smaller than most off site resorts.
And since I mentioned off site resorts, here's how they would compare.
Generally, the off site resorts are considerably cheaper (like 1/4th the trading power required) and noticeably larger with a more standard sized kitchen, and many are also higher quality properties. But of course they lack the on site perks (shuttles, EMH, dining plan availability, etc.), so for many it's worth the extra to stay on site.
Wyndham Bonnet Creek is probably the only one I would put in a class by itself, only because of the proximity to Disney. It's essentially on site, right next to Caribbean Beach Resort (a Disney moderate hotel) between HS, Epcot and DTD. I would consider it higher quality than most Disney resorts. There are others slightly better, but more distant.
The numerous HGVC and Marriott properties are probably the best in the Orlando area and aren't much further from Disney.
There are many other nice properties along the I-4 corridor and along 192.
It's really hard to make a BAD decision in Orlando, IMHO. There are plenty of great resorts and all of the Disney ones are good, too. I have most favorites and least favorites, but they're all good.