I don't think there is a way to tell, my example being seasons 5-7. Chip & Kim were lovable and Colin & Christie were not; both teams probably had the most screentime that season. Freddy & Kendra said racist things, yelled at teams, and complained about everything whereas Kris & Jon almost never got angry and enjoyed every location. Uchenna & Joyce were rather out of focus until one of the late legs, but Rob & Amber were in that season. The edits are done in the way that makes the most drama and entertainment.
Totally unpredictable with the exception of season 17, which was as subtle as a brick to the face: "Never been a f/f winning team!", "We want to be the first female team!", "16 seasons is too long!" etc.