i had an argument with a friend of my.
he said captain america only protects americans and only can be found fighting threats of america.
i was like wtf? he is fighting overall planetary threats that could easily effect the entire world.
its not like before captain america saves someone he tells him "may i see your green card sir" or anything.
anyway i think they are both very inspiring
Cap is inspirational because, for a guy with low-end-of-the-scale powers, he's in there fighting with no hesitation, no matter how powerful the foe, if that's the right thing to do.
Superman is inspirational because, despite his immense power, it never corrupts him; he never loses sight of what's right, especially with regard to the sanctity of life.
I think this is what either would find inspirational about the other (note to self: re-read JLA/Av).