Thread # 295482 on this subject... oh well...
I go back and forth sometimes. Kasparov really left nothing else to be proven, he was a chess giant. Fischer at full strength, for his own meteoric domination, was comparatively a flash in the pan -- it's hard for me to decide. Karpov is certainly up there with the all time greats, but what other proof do you need than the extensive KvsK matches? Didn't they play over 100 match games between each other?
And I don't think many ever argue that Karpov > Fischer.
kasparov with no doubt
also i think karpov better then fisher