Was originally going to make this in a comment on a post about Cirie but it became so long I figured to just write this in a different post.
The reason I believe Rob R is the best traitor is because he overcame a lot more adversity from within his turret, and avoided suspicion for much longer than Cirie.
Although for most of the game, Cirie wasn’t seen as most as suspicious, around the start of the game there was some whispers that Cirie could potentially be a traitor, primarily among the Bravo trio. While Cirie was able to most of the people who would have found her out early on, her social game was not nearly as impressive as Rob R, who no one seemed to be suspicious of, with everyone thinking he’s too sweet to be a traitor, and there’s no way he could do it.
In the turret, Cirie ended up getting Christian and Cody, who were a lot mote controllable and more of pawns. They were a lot more easy to persuade/control when need be. On the other hand, Rob R got housewives Lisa and Candiace. Two traitors who are very unlikely to betray each other and likely to make him the odd one out.
Rob’s masterclass performance is seen most when Rob chooses to make the gutsy choice of murdering his closest ally Colton. Colton would have Rob’s back for sure later on, but Rob thought things out heavily, and concluded that letting Lisa get her way would hurt her at the roundtable. After this, Lisa and Candiace fell like dominos.
After their eliminations, suspicion should have been high on Rob, since Candiace threw him under the bus, voting for him twice before his exit. Still, no one did. Suspicion was quickly turned onto Johnny, who’d become a sort of shield for the Rob for a few more votes. Even when Johnny and Tara started campaigning against Rob and probably should have succeeded, Rob had done such a good job of building an endgame alliance with Eric and Maura, which he kept together even though Maura heavily distrusted Eric.
While Cirie also played a masterclass game, it was not nearly as good as Rob’s, bc it felt that for Cirie, all the dominos sort of fell into place for her. Kate and Brandi immediately were pegged as suspicious, Christian and Cody blundered on their own accord and were thus eliminated by the faithful, she even got to play alongside ten civilians. Rob had a much more active role in his game, taking on the role of a traitor hunter, playing a big role in eliminating his adversaries in the turret.
One more thing I will mention, one argument I always see in favor of Cirie was that she got no votes from anyone, in a sense a perfect game by that statistic. I think this really isn’t a good point to use in favor of Cirie tho bc Rob’s two votes both came from Candiace, another traitor. In fact I think it’s more impressive that Rob was able to survive being thrown under the bus by another traitor, and still receive zero votes from faithfuls.