So i guess neither then

Britney.

Rihanna

Rihanna

Britney only sold more albums primarily due to the climate between 1998-2004 (aka where like 90% of her album sales came from)
Rihanna sold more records overall
x100 bigger on streaming
8 Grammys vs 1 Grammy
More tour gross
14 #1 hits vs 5
29 top 10 hits vs 13 (someone confirm?)

Britney does have some very memorable moments and songs i'll give her that but Rihanna has obviously had the bigger career..

And Rihanna only has more single sales/streams due to the climate.

For all-time artists:
Britney:
Album sales - #44
Single Sales - Top 20
Streams - Top 20

Rihanna:
Album Sales - Outside Top 100
Single Sales - Top 5
Streams - Top 5

Britney also has a higher touring gross and 6 #1 albums vs. 2.

Welp

Selling albums is much more important than selling quick little singles.

I don't like Britney but I have to admit that her album sales are impressive.

Rihanna by far

Rihanna

but Britney had such a high peak

I'll actually go with Britney on this one. Rihanna may not have surpassed Britney as of yet but she will very soon.

lmaoo
britney of course
will she 4ever be compared to other "current" pop singers

Rihanna has surpassed Britney

Britney can still top iTunes 20 years into her career. Queen of longevity.