Since there is a debate about this and that i didn't want to continue off-topic in the other one, decided to make a new thread about this
Conditions :
- Killer Bee is in his war arc version
- Itachi is healthy
- They have manga knowledge of each other
My opinion: I already said it in another thread, but i believe B wins for the following reasons
- 8 blades B is superior to Itachi in close quarter, was literally dominating him on panel and could launch his attacks faster than Itachi could release Amaterasu
- Chakra arms counter amaterasu
- Susanoo defense is also useless because the V2 chakra arms can attack Itachi from the bottom a little bit like Gaara did with his sand
- B also has much more fire power with the whirlwind or continuous bijuudamas
- B also has much more stamina, chakra, advantaging him in case of long terms battles
I believe the only debatable arguments for Itachi is tsukuyomi and totsuka, but i think it's already debatable if totsuka can even pierce through V2 shroud. If the databook saying that totsuka is a variant of kusanagi blade is correct, then it's entirely possible that it couldn't go through the shroud at all considering kusanagi failed at doing this when facing Naruto's chakra defense. But even if it somehow could, i believe while it's attack speed is fast, it's a bit overrated. Everytime it was used in the manga, it was against people who were caught off-guard(Orochimaru was monologuing without paying attention, and there was a smoke blinding Nagato's vision, not to mention even with that, Kabuto implied he could have dodged it if Nagato was more mobile).
I think totsuka's attack speed depends on two things, the Susanoo arm speed and totsuka's maleability to increase in length like Kusanagi and thus it's attack speed shouldn't be any different to Sasuke's or Madara's when using the Susanoo sword attacks, except of the advantage of increasing in length, as well as the hax sealing technique. Kabuto implying Nagato could have dodged totsuka if Nagato was more mobile also suggest that people on Kabuto's level of speed and above shouldn't have any problems dodging it, and B is a fast character, with shunshin that blitzed entire taka once, has V2 that moves even faster and thus i believe, he shouldn't have problems dodging it especially now that he has manga knowledge on it.
And with him being able to do this, the chakra arms would counter Susanoo from underground and ultimately allow him to win. And even if he somehow didn't, he still have the advantage in terms of long term battle due to his much more higher chakra supply
With all that said, i acknowledge that Itachi has a chance to win with tsukuyomi, but imo it's debatable if it can work on a perfect jin or not. Also with manga knowledge, B might have adapted to Itachi's advice of avoiding eye contact with him when he was pressuring him with his 8 blade fighting style. That or B's fighting style was simply too much for Itachi's sharingan to follow
