Vanilla, cousin incest, and anything up to softcore bondage (Nana to Karou is my limit) otherwise I'm one of the few guys that actually reads H-Manga in my spare time for fun
Having to pick one type is hard, but if I had to say one over anything, it would have to be vanilla or wincest. Tosh is just too much of a god as far as art goes for me
I've been liking some younger sister stuff, but most of it is pretty awful so I usually browse some of my favorite artists like Yoshiura Kazuya who does the best NTR, Kiyoshirou Inoue who is really good at faces and yandere storylines, Tsukino Jyogi who draws lust like no-one else and of course Shiwasu no Okina with his crazy plot lines. Also Gunma's earlier work, since I'm a fan of Ichigo 100% and I''s, his women all look the same though.