It really bugs me that people really think this.Kabuto had many advantages and still got owned
itachi had much more advantages than kabuto.
1.Itachi couldn't kill him because they needed to end edo tensai
and Kabuto couldn't kill sasuke becuase he wanted to capture him.
2.He was in a cave and that benefited him. Its like people saying Kisame> Kakashi and they fought one time in the middle of the ocean
Itachi had EMS Sasuke on his team, and the cave helped him with one jutsu...
OT:A bloodlust Itachi non Edo or Edo would wreak Kabuto low diff
a bloodlusted SM Kabuto ends a non edo itachi.
You wanna know itachi's advantages over kabuto?
1) Unlimited chakra
2) greatest regeneration in the manga
3) No strain from using the MS
4) EMS Sasuke as backup
5) Kabuto had to hold back because he wanted EMS Sasuke alive
And even then, Itachi got 'killed' 2 times before he with sasuke's help was able to put kabuto into izanami. Put alive itachi in that same situation and he gets ended by tayuya's genjutsu, ended by white rage + chakra scalpel, or just outlasted since he's never hitting kabuto with totsuka and amaterasu can just be shed off or oral rebirthed from.