I prefer Black XS myself. (it's my scent of the day). Bulgari Black is unique, and I like the smoky rubber & vanilla, but the dominant leather note ruines it for me. I can handle a hint of leather as a background note, but when it takes center stage in fragrances like Bulgari Black and Midnight in Paris, there's something about it that gets up my nose and makes me sick. For a smoky, vanilla/tonka type scent, I prefer something like YSL Body Kouros over Bulgari Black (since it avoids the leather note).
"The most beautiful sea hasn’t been crossed yet. The most beautiful child hasn’t grown up yet. The most beautiful days we haven’t seen yet. And the most beautiful words I wanted to tell you... I haven’t said yet…"
-Nazim Hikmet Ran