Brit in terms of sales and impact. Not sure about awards.

peak: Britney
overall: Rihanna

Singles : Rih by far
Albums : Britney by far
Impact : Britney
Awards/Acclaim : Rih

Rihanna will be a legend, she has the hits, sales, she only lacks the iconic moments (music related that is, the Chris Brown mess is pretty much a pop culture milestones) which she'll get once she becomes a good performer (she's improving). Britney is a legend.

Duh, Rihanna by far.

Britney and will always be Britney

U mean the one who had to hop on other rappers songs in order to achieve that status?

i think it will be rihanna in 3 - 4 years.

Britney felt like the bigger star even though Rihanna definitely dominated radio 10 times more than her

Britney by about 48% in terms of music sales.

Are they pretty much even in touring?

Britney feels a lot bigger and undoubtedly had the bigger peak/more iconic songs and moments. But Rihanna has much better longevity, I see her career lasting a long time yet whereas Britney at the same point in her career was slipping.

Brit.

Britney but you should compare Rih to her peers, It's not only fair but also more accurate

Rihanna obviously..

More record sales
More chart success
More acclaim
Bigger tours

Still Britney, but Rih will overtake her in an album or two.

How do you measure success?
Longitivity or peak?
I'm gonna have to go with Rihanna on this one.

Is this a joke thread The ...BOMT era alone >>>> Rihanna's entire career.

What?

According to Chartmasters.org Rihanna sold 238,500,000 records WW and Britney sold 169,600,000. Remove features and Rihanna is still ahead.

it's still Britney but Rihanna will take over really soon