They have not had long enough careers. IF they are both around in another 15-20 years we can ask the question again.
Who is Britany Spears?
You should try coming out of that cave youre hiding in. I dont like music and I know who she is. When a song comes on the radio its everyones favorite game "Ask E the name of the song and the artist". 99% of the time I get it wrong.