Danzo wins more often than not, but only because of izanagi
In base Kakashi is the superior ninja, however when izanagi comes out Danzou can outlast Kakashi.
However, Kakashi always has Kamui which he can use via bunshin feint, then Danzo is prety much ****ed.
I'll say Danzo wins 7/10
Kakashi wins 3/10