Don't start an argument if you can't keep it up. Sales are circumstantial, peaks and positions aren't (especially according to you since you were comparing Britney's singles to Gaga's).
Anti has a number 1 hit and has spent 5 weeks in the top 3. It also is getting positive press for Rihanna unlike the backlash that Lady Gaga got from Artpop. Rihanna always wins. The monsters tried it tho