Clean simple design will be easy to reproduce in small size. Of the three, #7 appeals to me aesthetically with the heart on its side. The concept of two people represented in #9 is good but it does cut up the heart. I'd rather not have so much red in the design.
#20 and #21 I like the color coordination between the words and the heart and brain graphic. Also the "energy" marks, which give these logos some sense of action. I like the unorthodox use of green for the large heart. #22 This graphic is a great representation of the heart energy "radiating" to the brain. On all 3, I like the use of three colors. Good font.