Is not fair to compare those albums like that
Dangerously in love" is Beyonce's big debut album ... "In the zone" is Spears 4th studio album
"B'day" is Beyonce's sweet 2nd album, "Blackout" is Britney's 5th album
"IASF" is barely Beyonce's 3rd album, "Circus" is Britney's 6th album
"4" is just bey's 4th album and already underperforming while Britney still getting hits with her 7th studio album.
Since 2003 still Britney got more #1s WW, topped more international charts, sold more singles worldwide.
And Britney sold more concert tickets and grossed more than Bey's tours.
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