If I misunderstood the SSR description then you're right, it's a pretty significant difference. I read the descripion of the hydrotherapy treatments in the SSR brochure to be a massage directed by the jets in the tub rather than by a therapist performing an actual massage while the client is in the water. But I've never had hydrotherapy (more's the pity) so perhaps I am misinterpreting the information.
With either package you can't go wrong, it just depends on the type of experience you and your SO want to have. Go spa!!!
I think we'll still go with Mandara.
They have a couples suite which includes a meditation garden and a treatment room where you can also have treatments together. I like the idea that DH and I will be sharing our massage experience simultaneously. And I love the idea that we will share a bath together (with no one else around!).
This is the actual treatment description from the TimetoSpa magazine I get each month:
After a glass of rich red wine, enjoy an aromatic massage side by side and then an Elemis Exotic Island Flower Bath together. You will also be given a bottle of Elemis' sensual Exotic Frangipani Moisture Melt to take with you.
BTW, Momrek06 - those cabana massages on Castaway Cay are to die for, aren't they? I wish I was there right now!!