Jon Jones has never lost (that DQ doesn't count) and he's DOMINATED almost everyone he's fought -- but he ain't the G.O.A.T. ... so says Daniel Cormier.
DC -- who's fighting Stipe Miocic at UFC 241 this Saturday -- joined the guys on the "TMZ Sports" TV Show (airs weeknights on FS1) ... and was asked who he considers the greatest mixed martial artist ever.
The UFC heavyweight champ said himself -- along with Mighty Mouse and GSP -- were best .