Fischer. Case closed.
Anyway, lots of controversies, but you can't deny that Anand is legend when he became world champs many times!(!) and worthy of comparisons.So why you should defy that when this is natural truth
Let's also count the number of times Kasparov "became champion."
1995-Your hero Anand!
Now let's count Anand
I didn't miss anyone right?
Pfffft! If Carlsen and Kramnik can be brought into the equation, so can Fischer.
personally, i would say Kasparov - but i would not say that there is no question about it. Anand is also a great player.