Not only has Rihanna sold more records than Beyonce (She's in the top5 highest selling female artists of time) she has now surpassed Beyonce with the most No.1 hits on Billboard's Dance Club chart
From Billboard Magazine
Rihanna reigns atop Billboard's Dance Club Songs chart (dated June 27) for the 23rd time with "Bitch Better Have My Money" (2-1). With her latest leader, she eclipses Beyonce (22 No. 1s), who last topped the chart in February with "7/11."
Rihanna now trails only Madonna (45) for the most No. 1s in the chart's nearly 39-year history, dating to its inception as a national survey in 1976.