I think one way to confirm who is more popular would be by solo tours. A Christine solo tour and a Lindsey solo tour. Which would get more audience?
It would define also where they are more famous. US? Europe? Japan? etc.
And if I add the "what if" factor, I would have done this tours in the 80s, in the 90s, and today. Fame is so temporary, so is fleeting and changeable. So.. when were they more famous??
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