Rest are some sort of techniques. In Gai's case, his 'Night Moth' is the strongest taijutsu attack and even that didn't do the crater effect... Solely because Gai's attacks in 8-gates are concentrated impacts, so he's different.
If you guys are thinking gai's is stronger. That's possible, but why would it even matter? Naruto did that punch in base, gai's supposed to die after using 8 gates.... Nuff said