Endurance is arguable, in general G2/G3 Luffy has the stronger attacks only Zoro's strongest attacks are much more lethal. Luffy has the faster striking speed, faster reaction and movement speed. Zoro's Sanzen Sekai was not mountain level and they were nowhere simultaneous, if it really came down to it I would say Luffy edges him out no lower than high-dif.
11.8 megatons I believe comes into that range quite easily and the SS I was talking about was when he used the same attack on Pica's arm, five cuts at once.
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