"Would Carlsen have beaten Capablanca?" by GM Gormally
Calling the Fischer the 9th best player is a joke, especially judged by someone way weaker. Nigel Short said how can we judge the moves of a 2800 player. If Nigel Short can´t do that, i dont think some GM Gormally with a peak rating of 2570 can compare the strength of FIscher to other top GMs.
I think its very presumptuous to do that, but its only my personal opinion.
Maybe this is an insoluble question.
But I will say Carlsen because modern chess players have far more disciplined habits of preparation than they had in Capablanca's time.
Capablanca's personal chess habits were also poor. He did not prepare at all for his match against Alekhine whereas Alekhine studied all of Capablanca's games.
Physical health also matters. Capablanca did not look after himself, often indulging in late nights of wine, women and song.
So for me I say Carlsen. Chess playing strength I say =. Even take computer prep away from Carlsen. But it's personal habits and self-management that would tip it in Carlsen's favour.