They have done research on that. They took all the 20 world champions and analyzed their games with Stockfish 6 set to 3150 rating. So after 25.802 games and 2 million positions the conclusion was.
Best Player?
Carlsen-2961 Kramnik-2868 Kasparov-2816 Fischer-2775 Anand-2759 Karpov-2698 Capablanca-2664 Tal-2636 Spassky-2619 Smyslov-2618 Botvinnik-2602 Euwe-2547 Alekhine-2547 Petrosian-2543 Lasker-2498 Morphy-2409 Steinitz-2323
https://www.chess.com/article/view/who-was-the-best-world-chess-champion-in-history
https://www.chess.com/article/view/should-we-trust-computers
https://www.chess.com/article/view/were-players-in-the-1800s-terrible
https://www.chess.com/article/view/the-5-most-dangerous-chess-players-ever
https://www.chess.com/article/view/adolf-anderssen-mr-slice-and-dice
https://www.chess.com/article/view/adolf-anderssen-more-slicing-and-dicing
https://www.chess.com/article/view/behold-steinitz-the-austrian-morphy
https://www.chess.com/article/view/steinitz-changes-the-chess-world
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Who is the best chess player of all time?