With knowledge: killer bee
and depends if the hachibi can break him out of tsukyomi
without knowledge: draw/ could go either way
amaterasu will end bee, unless samehara can absorb it or he can do a substitution with his tail like he did against sasuke.
I don't think susanoo can take tailed beast bomb, unless mirror of yata absolutely deflects any attack. And if that happens, samehara can most likely cut through susanoo seeing as its made of chakra and a jutsu.
though i might change my opinion if someone would post why itachi would win instead of just itachi wins