TBDT, Hot 200 album #1, Charted for 51 weeks. / Black out, Hot 200 #2, charted for 34 weeks.
(2007 Source: Billboard).
Let's go back to 2003/2004. In The Zone end of 2003, UMS start of 2004.
UMS, hot 200 album #1, charted 66 weeks / In The Zone Hot 200 Album #1, Charted 45 weeks.
Let Go, Hot 200 Album #2, but Charted 97 weeks, Britney's album Britney, Hot 200 #1, charted 58 weeks (UMS charted longer 3 years later, with same peak!).
Source (Billboard)
Only facts here, no delusion.
Girls, Avril has the longevity, and both Let Go, UMS, TBDT outsold the albums they were close to release to. So yeah... we will see if Britney can finally beat Avril in album sales this year, I think it will be close, but there's no denying that Avril has been queen of the album since she started out. Hopefully she can continue, And UMS didn't even have a top 20 first single to help its sales, so don't judge WTH's success on Avril's eventual album success