I'm going with GSP, because higher level competition than MM and didn't have big physical advantages over everyone he fought or take steroids like Jones.
Cowboy is an easy fight for McGregor, he's always struggled against guys with decent boxing and he's got a shorter reach than McGregor even though hes a bit taller.
Hes the best featherweight of all time his record speaks for itself, beat the 2nd and 3rd best with ease (Aldo and Holloway) then went up and won the belt at a higher weight class.
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