Depends on who you're a fan of. Logically, I'm inclined to believe that neither one, being quote unquote "good guys", would challenge each other. (I personally root for Cap America, if for some reason they did)
Captain America
Captain America's shield is nondestructable. Green Arrow could try to kill America but America would have Hawkeye with him.
captain america
captain America
Captain America. It would be a close fight because Santa has an army of Elves, but then Captain America would throw his shield at Santa's neck, killing him. Or, Captain America would be too afraid to fight Santa and give up, not wanting to kill an icon for many Americans.
I would have to say Khan, he looks smarter than Captain America.
Captain America, obviously. He would beat Deathstroke up.
The only thing Captain Marvel has over Superman is his magic lightning to transform from Billy Batson to Captain Marvel and viceversa. Also, Superman is vunerable to magic.But Superman has alot more powers than Captain Marvel.So he could make himself vunerable by changing back and forth so it's pretty much an even fight. They showed this in an animated Superman once and When Cap turned into Billy, Superman simply placed his hand over Billy's mouth and said" "That's enough kid." Although by right's Superman won that fight, it was later shown that what they were fighting over proved that Cap really won.
batman
batman
abomination, because he is strong as hulk.
This is unknown as Captain America has not yet fought his final battle.