I usually go to the Grand Floridian Resort & Spa for spa treatments and have also been to Saratoga on a few occasions.
I really like the facilities at Saratoga (going back to the Disney Institute days) but think it's a little less on the pampering or experience. It's hard to explain but I think that GF was more about the experience, taking the time to kick back and relax, and be calm, vs. great facility and let's get moving to your massage.
I know that Grand Floridian is closed (from what I see on this site) but I don't think you can go wrong either way.