Let's not forget the confidence angle. OJ gotten away with two murders and a few other things. This type of stuff is old news to him. He's going into jail tan, rested, and ready.
Titus, meanwhile, has had to deal with prison, cell shakedowns, etc....
Titus was never a real badass, he allegedly killed a drugged up girl, and sucker punched a few smaller bodybuilders.
OJ still takes this mythical grudge match:).