Sasuke only broke through Tsukyomi because he is a True sharingan user ( An Uchiha ) , and that's why even kakashi who had the sharingan couldnt break it
But again , I agree with whoever said Itachi couldnt use Tsukyomi on Pain who has the rinnegan , while Sage frog song genjutsu could.
While Tsukyomi is easier to use and of course very powerful, I thinnk the sage's frog song genjutsu is more powerful and it only takes that much time cause it has so much power in it
But which one I prefer? Tsukyomi of course, Since it's fast and almost equally powerful