Base Kakashi can't use Raikairi, and Itachi's Katon is more than likely superior to Kakashi's..
Their speed isn't too far off, but Itachi is probably smarter. So base Itachi takes it.
Look at this
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[video=youtube;HZhZlKvMDKA]https://www.youtube.com/watch?v=HZhZlKvMDKA[/video]
How "base" are we talking about?
No MS techs base? (Itachi would take it)
No sharingan base? (Kakashi would take it...maybe)
Or no ninjutsu-genjutsu base? (It can go either way...Kakashi has better stamina so he can have chances of outlasting, but Itachi has a better affinity with weapons; but i am leaning towards Itachi)
Itachi can use jutsu faster than kakashi's sharingan can even track.
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Itachi takes this.