I think it depends on what I'm making.. I love Caron Simply Soft for Baby Blankets. But for clothing items I like all different types of yarn. I knit a dress using Berroco Zen (bought it a long time ago at a discount) and to my surprise it came out really good. I also like Berroco Foliage because the way it changes color (started a project but put it away, oh no!)
I like rayon yarns mixed with either bamboo, etc. It all depends.. Duh!