Zoro >= Luffy :
- Zoro spent 2 years training with WSS , Luffy spent 1.5 years training with Rayleigh
- Against the octopus , Zoro did the most damage to it
- Zoro one shot Hody Jones underwater
- Hyozou blocked a G2 jet pistol from Luffy and he called him pretty strong. Zoro one shot him and said " you're not enough to kill my boredom"
- Luffy couldnt even damage to the dragon in PH , Zoro one shot with a shi shishi sonson
- Luffy was losing to Monet , Zoro neg diffed her.
- Apoo 2 shotted Luffy , Zoro one shotted Apoo
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Against the same opponents , Zoro outperformed Luffy.
In Post TS , Zoro has been given Enma as a tool to get stronger.
Luffy has been given Advanced Armament and Advanced Observation
Both Luffy and Zoro are on the roof now meaning that they will be fighting the yonkos. If Zoro was not at least as strong or stronger than Luffy , what reason would there be for him to be there?
In other words , Grandmaster is simply built different