I have not had a session with either therapists, although I have done research on both.  Is it Tantric Massage that you are searching for or are you looking for a Tantra Teacher?

Kasana is affiliated with a group called The Institute of Tantra.  I have not met her, but based on the web site I believe she has some extensive tantric training.  I thought I read a review of someone from the Institute of Tantra, and my recollection is that their first session included nothing remotely sensual - just visualization, tantric breathing exercises and energy movement.  Great tools for expanding your tantric awareness, but perhaps disappointing if you are looking for sensual massage.

While I have not had a session with Astarte, I have met her through someone she used to work with.  She has a nice bubbly personality, but I doubt she has had much formal tantric training.  I suspect she would provide a solid sensual massage.

If you like, PM me and give me a bit more information on what you are searching for.  I may have another name or two to consider.