I like what Klimt I've seen but never heard of Schiele. Wiki page has some pics about which I can't see the attraction.
Make up your own mind https://en.wikipedia.org/wiki/Egon_Schiele but to me many look purposefully ugly.
Happens I did notice one that looks like butt-head https://en.wikipedia.org/wiki/File:Egon_Schiele_-_Grimassier...