I've heard good things about the Swan spa, for what it's worth.
For me, the Swan is better because of the educator's rate offered there! In general it's substantially cheaper anyway. It's also closer to EPCOT, which is our favorite park. The tradeoff is the inconveniences of staying in a non-Disney resort.
I'll also admit to being biased, however. I teach at Skidmore College, and the resort looks nothing like Saratoga does or ever did! I suppose this is a minor concern and not worth your consideration, but this is the price my girlfriend and I pay for being too intimately connected with the original!