MJ will always be the King of Pop. He accomplished these outrageous sales long before anyone had ever conceived of iTunes. Albums cost $10 in the mid 80s, just as they do now, only we're talking 1984 USD and not 2014 USD... so they were actually about twice as expensive as they are nowadays.
Taylor is alright, I generally prefer her to other pop artists of her generation. But these sales records won't mean a damn thing in 10 years, much less 30. The parents of the bride and groom will get tipsy and ask the DJ to play Love Story. The DJ will see "Taylor Swift" written in the Do-Not-Play list. (S)he will play Billie Jean instead, and the dance floor will be packed with every generation in attendance because freaking nobody doesn't like Billie Jean.
