Kaguya's will already said it
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So Amaterasu, the jutsu that tired heavily injured base Naruto swiped away like an annoying fly is stronger than Night Guy, Perfect Susanoo Slash, and Kaguya's Eighty Gods Vacuum Attack

. For real Amaterasu is a strong/powerful jutsu, most of NV gets caught by it. But there is a plethoria of counters for it among the higher tiered character and it is FAR from being the "most powerful physical attack". BZ also claims Tsukuyomi is the most powerful genjutsu but he obviously knows about IT so yeah :lol.
OP: I go with Kamui. With that one jutsu Obito was able to keep up with the likes of Naruto, Kakashi and Gai at the same time. Susanoo, Amaterasu, and Tsukuyomi are more damaging/destructive techniques.