Well Xscape's opening week was bigger than all of them, and has sold more, at least as of now.
But i'm not mad at Janet. Unbreakable was better than Xscape, save for a few songs, and she deserves it so much. It's a nice slap in the face to those that called her irrelevant and tried to diminish her legacy for all those years
In what world... How is this even comparable? MJ debuted in 1969...
Lol true. Album sales were calculated very differenly back then. Off The Wall peaked at #3 yet sold over 20 million copies so this isn't a very correct method to measure longevity but i'm still happy for Janet.
You don't calculate longevity like that. 
