Falcao's 26, He will have 2 or probably 3 more years at the top.
Aguero's 24 and he has much more to his game and He is nowhere near his peak yet.
I like Falcao but I don't know if he is like Dzeko, everybody thought Dzeko was going to be one of the best strikers in the world by judging him for Wolfsburg in a handful of CL games and on youtube.
Aguero's by far the more complete player, Falcao is an exceptional goal scorer, Nothing more nothing less.
From what I've seen, I disagree. There's more to Falcao than just goal scoring.
I haven't seen that much of him (but how much have you?), but it seems to me that he has far too much basic footballing skill to be dismissed as a mere goal scorer.
I do agree that Aguero is a more complete player - but not "by far".
They are both tremendous talents - and if City manage to get Falcao to play alongside Aguero, that would be sensational.
(Another Atletico player worth considering, in a very different role, would be Arda Turan).