Instead of looking at their entire career you take snippets, cut and paste, and skew the categories in your favor.
I had a friend like you. He stated LeBron was better than Jordan because he won a championship at a younger age than Jordan meanwhile Jordan played college ball. Fanboys are gonna be fanboys.
Mayweather is way more a noticeable figure than McGregor is. Get over it. Yes, McGregor has made huge waves on the MMA scene and pulls in pretty pennies after every fight, but he falls flat on his face when comparing him to Mayweather. Wake me up when McGregor gets $100 mill to fight.