One's a politician, the other is a convicted felon. Southpaw/Orthodox. Black/Asian, Goldenboy/Toprank, Defense/offense, Brittle hands/itchy socks, leader[Floyd]/follower[Pac], Undefeated/defeated, boxer/brawler, Ugly wife[Jinkee]/beautiful wife[floyd's *****], Rapper/Singer.. those are just from the top of my head.
Floyd can adapt well in the ring, whereas Pacquiao only seems to be able to follow instructions well.