I've been to Mandara at the Dolphin and Senses at GF - both for a massage and a pedicure - and I preferred Senses. Mandara was really empty and under construction when I went (it was almost two years ago, so probably not a concern now). The services were fine. At Mandara, I changed for the massage in the massage room, and then kept my belongings with me to the pedicure area. I'm not sure if they have lounges now that the construction is complete. GF provided a robe and sandals, as well as lockers in the lounge for personal items. The lounge was really nice - there was fruit-infused water and snacks (fruit, pretzels, and M&Ms), curtains that you could pull to separate yourself from the person in the neighboring lounge chair (or leave open if you want to chat), magazines to read, and nice music playing. The bathroom also included more toiletries - I don't recall any in the bathroom at Mandara (again, that could be different now). Senses also offers a 15% discount for AP holders and DVC, but Mandara only offers a DVC discount (which varies from 10-20% depending on the day of the week). One thing I did like about Mandara was that I was able to take my DD to Camp Dolphin while I was at the spa, and because of what we spent at Mandara we actually were comped the two hours at Camp Dolphin. When I went to Senses, I took DD along but would probably have arranged for her to go to Lilo's at the Poly if I hadn't planned to take her with me.