Mayweather moves better, defends better, is faster, and he punches a lot harder than Mcgregor.
Mcgregors only chacnce will be if his corner load his gloves, or the referee allows him a few low blows, rabbit punches, and the odd headbutt or blow to the back of the head.
Regardless of the result this is all about hype and entertainment - and Mcgregor is very entertaining.