Umm ... none of them really. Most are hardly basic rub and tug and have less than stellar attendants. One, Touch of Class, is just a disguised bordello, so you get little of a massage parlour about it and much higher prices. The only door to it opens onto a busy downtown street (Princess St.) so be prepared to see the slightest acquaintance as you enter or leave.
In short nothing of the Kingston scene approaches that found in the major cities. A crummy strip club, massage studios that wouldn't be able to survive elsewhere and a very, very spotty incall/outcall scene.
I suppose 20 years in downtown Toronto spoiled me. I have very fond memories of living 3 blocks from 50 Yorkville.