Just my own personal experiences:
Massage skills: Candy>Cici>>Sandra (I have not had the pleasure of seeing Anna, Candy is one of the best true masseuse in town if she is not distracted by everything else happening in the spa)
Extra service availability: Cici=Candy>>>Sandra (Although there was some nudity, Sandra's offering was quite limited for me, dealing with Cici was straight forward, I want it, I got it)
Lookwise: Sandra>Cici>Candy (I know there are Candy fans here but I do not find her attractive, probably because she was constantly barking in Chinese through the wall while she was massaging me)
Agewise: Cici>Candy>Sandra (Remember, Cici is probably 60+, don't expect some sweet young thing massaging you, but what a body for a GILF)
Attitude: Cici>>>Sandra>Candy (Cici is like a fine wine, as she aged, her edges mellowed out, not as greedy, no constant upselling, much more pleasurable to deal with)
Cici wins hand's down if I were to return. Based on what I have heard, I probably should book a session with Anna just to complete my list but then I would have to book a session with a micro afterwards for complete relief. This is probably the reason I hadn't return to try Anna yet.