Greatest of Men

[Kransha]

Well, that is VERY hard to say.

First, compile some great men.
-Theoden, son of Thengel
-Eomer Eadig
-Faramir of Gondor
-Aragorn, Elessar Telcontar
-Imrahil, Prince of Dol Amroth
-Boromir of Gondor
-Erkenbrand of the Mark

There are others, but those really stand out.
Now, eliminate those who are not as great as others.
-Theoden was a gentle, kind, and benovolent king, but possibly lacking in some places.
-Eomer was extremely heroic, but the also had some tempermental flaws.
-Imrahil was brave and loyal, but not notably so.
-Boromir, great man, but I'm sure we all know his one weakness.
-Erkenbrand, same as Imrahil, just not important enough.

So that leaves...
-Faramir,
-Aragorn,
In my opinion, it would be Aragorn. But Faramir was able to resist the Ring's temptation while Aragorn might have fallen to it.