Board Thread:Versus Debates/@comment-26958911-20151010214426/@comment-25122992-20160102153944

What I've said earlier... There's no guarantee Itachi (a genjutsu-speciallised shinobi) cannot resist a genjutsu like this at all, but Jiraya being instantly defeated if trapped in Tsukuyomi is death certain. But personally I think neither of them would succeed in casting their most powerfull genjutsu - both can use the main drawbacks (eye-contact requirement in Tsukuyomi's case and a significant preparation time for Toad Chant) to avoid being caught.