Lets put it this way...Britney dated Justin Timberfake---and she UPGRADED to a backup dancer, who had two kids of his own and left that woman for Britney--and he is now a fat fuck. Rhianna dated Chris Brown, who showed the world that she knows how to take a punch, while in a Lamborghini, and she is dating some ball player...
Advantage; Rhianna
Rhianna looks better naked, and has better booty
Advantage: Rhianna
Britney's father asked her to wear a bra---because her nips are harder than Chinese Math. Rhianna has nipple rings
Advantage: Britney
Face: Britney looks like her mother was drinking when she was preggers with her---that wide eye'd face of hers. Rhianna, well, she has that "model" face---easy to mould into what you want it to be. She has a better base
Advantage: Rhianna
Music: Both suck. But with Jay-Z backing, Rhianna sounds better
Advantage:Stalemate
Rhianna: 3, Britney: 1, Stalemate: 1