Hawk-eye and Captain America. Hawk-eye single handedly took down everyone in the Avengers. And Captain America Lead an army of super hero's against another army of super hero's and was only killed by a cheep shot sniper.
I would have to say Iron man..there can not be two bests...the reason: although when it comes to power and strength hulk and thor are quite powerful at times more so than Iron man especially the Hulk, iron man is vulnerable over the fact he is completely dependent on his suit but it is not the suit but the man behind the suit so actually I would change from Ironman to Tony Stark even though they are the same guy technically, it is Tony's genius that is the real asset that not only makes him as powerful as a demi god through advanced technology it is also his support technology that manages the avengers team... a perfect example is when he builds a suit for spiderman making him an incredibly difficult almost invincible adversary to his enemies also the captain america shield built by Tony Stark's father then later redone by tony himself
Define the meaning of Best? Captain America is the best Leader; Thor is the most Powerful; Hulk is the Strongest; Iron Man is the Smartest; Hawkeye is the best Marksmen; Black Widow is the best at being a Detective/Espionage Agent.
hands down....THOR!!!!! cuz' hes a GOD!!!!!!!!!!!!!! not the captain cuz' hes an old man or iron man cuz' hes red and gold or hulk cuz' hes stupid or hawkeye cuz' hes evil half the movie or black widow cuz' she was evil before being an avenger or nick fury cuz' he didnt do anything in the movie. I PROVED MY POINT!!!!!