Differences between Noblechairs Icon and Hero?

[Flying Pizza]

I am in need of a new chair and I have nailed it down to either the Noblechairs Icon or Hero.

I would like to know what all the differences are between these chairs are (besides appearance obviously ).

I have heard that the Hero is on the larger side, I am not a big guy, I am skinny and slightly short, would the Hero be too big?
Also, is the firmness of the seats any different?
Thank you.