Usman: 14-0, 5-0 in title fights, wins over Colby, Woodley, Leon, Maia, RDA, Burns, Masvidal x2
Khabib: 13-0, 4-0 in title fights, wins over Poirier, Gaethje, Conor, RDA, Barboza, Iaquinta, Michael Johnson
I think many people would automatically say Khabib, but if we look at things 100% objectively (I know, tough to do for a lot of Sherdoggers), I don't think the answer is conclusive at all. In fact it seems very, very even, both from an overall record standpoint and level of competition.
It would be very tough for me to rank one career over the other at this point, I think it's disingenuous for people to definitively claim that Khabib is one of the GOATS without also including Usman there. In fact I might give Usman the slight edge overall, as he has an extra title defense and has developed the ability to strike at a high level and finish people on the feet, to go along with his elite grappling (while Khabib remained a bit more one dimensional in his career). But I also wouldn't fault someone for ranking Khabib slightly higher, as there's some subjectivity there and both are top 10-15 all-time greats IMO. I just think objectively, the gap isn't very large. Would love to hear other objective Sherdoggers' opinions here who can look at things without using emotion.