Wet tested both (as well as a ton others) and given that they are pretty equal....
(I know, most of this is cosmetic, but I can see the spa from every room in my house! I want it to look as good as it feels)
Sundance Optima
pros:
-Love mahogony option
-prettiest cabinet of all
-great stereo
-great dealer support
-great deal I got
-disposable filters, less upkeep
cons:
-a little difficulty w/diverter system, want seats an STRONG foot jets together, can I do this?
-expensive
-no seat w/arm rests or wrist jets
Caldera Niagra
pros:
-like neck pillow
-love the foot ridge (I float)
-love the lighting, how the outside lights and inside lights change colors together
-like that one seat has arms, offers a little more variety
-no foot hump to trip over
cons:
-doesn't have a great color selection (I LOVE the dark brown shell, hard to find)
-Cant reach Euphoria foot jet from every seat (though the ones that you can't have fantastic calf jets)
-at rec warehouse (but I really like the salesguy)
-no stereo w/aux input (I want to watch home theater through my living room window)
This is for therapy and family fun. 2 kids, ages 2 & 10.
Wet tested d-1, Vita, Hot Springs, Tiger River, and Dynasty, and those are all eliminated for one reason or another.
Any input?