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This is considering he is still allowed to keep Curse Mark Level 1 & 2
Itachi showed great swordsmanship vs. Kabuto and already having Chidori he would want to improve itEh he wouldn't have any of his snake skills, but his genjutsu would've improved. Maybe his fire style also, but he might not have made so many chidori variants or became good with the sword. Sasuke probably would've been less versatile imo.