tbh, to compare jutsu/abilities like this you'd have to first make some assumptions.
1) both opponents start out prepared to fight. If not, then whoever gets the drop on the other will win almost all the time. E.g. kotoamatsukami is sight-based and instantaneous, so if shisui looked at obito just once that would be game over. Hiraishin would be an instant kill, since all Minato would need to do is wait for Obito to walk over one of his seals (note he can put that seal ANYWHERE), then it's an instant kunai to the skull.

2) both opponents begin with the same base knowledge; that is, both either know all about the enemy, or nothing about an enemy. E.g. if u know about kotoamatsukami, easiest counter is to close your eyes. For hiraishin, if u know where the tag is u know where he's gonna be, as the short 4th Ay vs Minato clip showed.

Given these two things, yeah Kamui is the most broken thing, period. Add in his sharingan gives Izanagi and Izanami, and almost unbreakable Susanoo... lul. Though i should note, the kamui tp is not instant like Hiraishin, so that's a major downside in battle. As in, tp'ing his body is instant, but tp'ing to another place takes a few seconds to 'warp in'.

But if you don't give those two assumptions... kotoamatsukami is the best IMO, cuz with that u can pretty much control the world. Only jinchuriki would be immune. Hell, u can probably use kotoamatsukami to turn Obito into your personal assassin xD.