since the new chapter came out every body has been prasing Itachi's izanami but if you compare koto and iznami the only advantage iznami has over koto is that it affects the user regardless of their five senses.From possible theories that i've hear izanami only has the ability To cast the victim under genjustu without eye contact nothing more While koto can manipulate the victim and use them how effectively the user chosses
P.S.Probably going to get flammed
P.S.Probably going to get flammed