Boy, I like them both too, but I have to agree with Cathy, I think I am more worked out with HSTA than HSC. The leg presses get boring after the first 3 cycles and the music is awful, but I'm pretty winded with HSTA. I have to add a few cycles of Imax 3 with HSC to feel good and worked out. A couple of the cardio segments in HSC just don't do much for me. Go figure.