Tried both. Unfortunately I had just one black lover, for some months until he moved and went back to Spain.
I love to feel BBC cumming in my mouth and try to ******* all that sperm. BUT when he fucked my ass and came, that was a wild experience (once I got used to his size). He fucked my ass like he wanted to reach my chest, pushing so fast and hard that I couldn't tell if I could make it. Hurted but was also so good, even came from that some times. Then when he came I could feel his cum, and the whole experience was so strong. I'd say both but if I have to chose one, def in my ass.