Kasparov. Karpov was a solid positional player and near impossible to beat in his prime but Kasparov was much more imaginative and I've always enjoyed watching his games more than Karpov's.
Karpov or Kasparov
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Karpov for the reasons above, but Kasparov is awesome to study!!
I would rather get a beer with Kasparov.
definately Kasparov, mainly because of his success and him keeping going.
I study both their games I have Karpovs Chess book with 64 games and Kasparovs fighting Chess 1993-1998 and I enjoy picking up either book and studying it on my kitchen table.
Who do you prefer?