Which chess player do you think is the best out of these three?

Garry Kasparov or Robert Fischer or Jose Capablanca?

Why Garry Kasparov of course, the other two are dead.

No, I meant of all time.

Sorry about that

That makes it quite difficult to answer without the ability to see into the future. 

Fischer.  There has never been anything like him.  He took down the soviet chess machine singlehandedly.  He absolutely dominated his peers.  You  can fit the number of people Fischer lost to (as a professional) in a single paragraph. 

He was the chosen one.

I believe that this question is extremely difficult - if not impossible - to answer, for a number of reasons.

Firstly, as far as ratings are concerned, FIDE did not adopt the Elo system until as late as 1970, so the ratings of many outstanding players like Steinetz, Lasker, Capa and Alekhine - to name but a few - can only be theoritised.

Additionally, there's the question of  tactics vs. strategy vs. positional play: which is more important, and who best represents (or represented) these three aspects.

Many fine claims can be put forth concerning a number of outstanding players, but in the end, it's all speculation.

Kasparov never played against Fischer...  Man, what are you talking about?

 i think you are right Russian_Boy

Kasparov is the best out of these three

I would say Fischer because he is a very clever chess player and  he plays risky.

Kasparov ofcourse.

There are some very good players not mentioned who lived in different periods... Morphy for example. I must say in my opinion Capablanca is the best out of those three, though I agree with rubygabbi that it is hard to compare tactics vs strategy vs postional play...