one thing bee would not get out of amaterasu becos last time he got out by attacking karin and sasuke had to cut his tail off to save her but what is bee gonna do this time?Itachi doesn't have experience fighting a jinchuriki. And Bee has experience fighting an uchiha.
Bee can get out of amaterasu by using the same substitution he did against sasuke. Tsukuyomi will not work because of the hachibi.
The only problem is susanoo and its mirror/tanking abilities. if the mirror can tank bee's tailed beast bomb, then advantage itachi. i'm pretty sure susanoo cannot tank his tailed beast bomb seeing that it makes kirin look like a chidori.
There's also the possibility that bee's samehara can cut through susanoo and even amaterasu.
I'll say they are even.
And killer bee is not on par speed-wise with A. They were challenging each other with their lariats, of course the raikage isn't going to dodge bee's and blindside him and go "Ha! told ya mine was better!"
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srry for double post