This is awesome because it showcases Britney's absolute lack of talent. Night and day compared to Rihanna.
Rihanna can't carry a tune in a bag without AutoTune. As singers, it's just down to which flavor of processed cheese you prefer. If this were really about voices, we'd be kicking Rihanna to the curb for a piece of Adele, and I don't see that happening in this forum.