It is always an almost futile effort to try to compare two persons in any endeavor be it, boxing (Ali vs. Marciano) Chess (Capablanca vs. any (Fisher, Tal, Magnus, Kasparov, etc.)) Capablanca was independent of psychology as Lasker noticed and mentioned and of computers. In other words, I would say he was the best ever of all champions, he came before all of the others, they learned and copied him, whereas he invented Chess in his mine and not as others on computers and software.
He had no external help as the later players had. In Russia all of the players got help from the government and the multitude of players that exist there as a national sport. Else they used computers to do research on players, openings, middle games and endgames.
We can see Capablanca's results from all of this.