saying womanizer half the song sure is better than using a meaningful comparison several times xD And chart positions mean nothing, the biggest crap can become one if it gets promoted well
And Britney is very well promoted, especially with all the scandals in 2007 and 2008, they are still working for her sales. Some people judge music or art on its meaning and dont even listen to meaningless music, thats the minority, the others dont really mind music and listen to everything thats catchy, no matter what it is(Britney fans, but many ayu fans as well and from many other artists, basically every top 20 artist has tons of them)
Tour setup doesnt really matter for me, first thing that matters is the sounds, its a concert after all, then of course, theres the liveness coming with it, lets see...Ayu around 70% live, Britney something around 0,1%? Her show has to be PV-level to satisfy me that way plus the 2009 setup of ayus tour is completely different and theres something about Britneys tours that is boring, really boring, it doesnt have any feeling and/or meaning to me at all, its just...high budget used in a bad way
About the dancing issue:
Britney is a dancer pretending to sing when shes in concert, so she has to dance on a way higher level than ayu, but she doesnt, sure, she dances better than ayu, but not that much better, but she should, shes performer in dancer direction and ayu is performer somewhere between singer and allrounder, so Britney should be superb to ayu, but isnt, britney is nothing compared to her dancers, she should be on the same level though