I definitely have preferences for firmness, but usage determines. For example, I never thought hard toys (like plastic, glass) would be enjoyable clitorally after some not so great experiences. But then the glass Icicle no. 24 changed that for me mainly due to shape (see my review, post mind-blowing). Taking things internally, some softness is preferred depending on where it it going in. I usually avoid jelly. Silicone is pretty great.