Based on my point of view i think that Shisui has strongest genjutsu. he was able to use Kotoamatsukami which was unique genjutsu that was said to be of the most highly effective genjutsu, even over tsukuyonomi. The genjutsu is so powerful that it takes about a decade to use it again unless by using hashirama cells to increase its speed of regeneration. The genjutsu enables full control of victims mind without him noticing.
I dont believe that there is any other genjutsu that can outdo this one.
I also believe that this genjutsu overpowers izanagi and izanami.
I dont believe that there is any other genjutsu that can outdo this one.
I also believe that this genjutsu overpowers izanagi and izanami.