I chose intellectual acumen. I feel that my T is ridiculously intelligent and has so much knowledge concerning psychology and counseling that this covers all of the other answers. She learns well and is able to transition our therapy to best serve me because she understands and "sees". Because of her intellect she is warm and loving (one, because that's who she is - but two, because it's also what I need and we click on a very raw level). As she can quickly learn and adhere that to something she has studied or has experience with she is very much flexible, adaptive, and sensitive to my distinct and individual needs. She is very stable emotionally and mentally because she knows she needs to be due to her intelligence. So for me, my T's intellectual acumen is the most important because it covers everything else.