I own both Bluegreen and Fairfield. Bluegreen is separate and apart from any involvement with Cendant on a corporate level. Fairfield is owned by Cendant, which happens to own RCI. You know about RCI? It's the largest exchange company we all love to hate.
Bluegreen and Fairfield butted heads in buying a resort development site somewhere in Florida within the last year or so. Details are a bit fuzzy but Bluegreen paid more than Fairfield and got the site for development. Bluegreen has had overtures from RCI but have turned them down (rumors, not facts, based on Bluegreen's aggressive development of new resorts, and other readings between-the-line).
I've had run-ins with vacation guides from both resort systems, but overall my experience with Bluegreen has been better. Cost of doing business with Bluegreen is also cheaper than Fairfield.