lol if you're gonna judge them based on their genjutsu skills, then Kakashi is stronger.
Sakura saw through Kabuto's genjutsu at the stadium, but she got toally owned when Kakashi used his genjutsu during the genin exam.
Sure she may hav gotten a little (little little) stronger since then, but if Kabuto is oh so powerful like u say, she shouldve fell for it.