Considering Beyonce started in 2003, she has left Rihanna in the dust album sales wise when you count
Dangerously In Love, which did like 4 million in the states and over 10 million worldwide.
I don't. Know what you're reading, but Good Girl Gone Bad/
I Am Sasha Fierce and
Loud/
4 are where Rihanna was ahead of Beyonce. Considering Beyonce is an aging artist in the Pop field and Rihanna is still in her 20's, she should be leaving Beyonce in the dust especially now. Beyonce's most recent work albums are clearly outselling Rihanna's most recent.