iron man or captian atom, who would win?

Answer 1

Captain Atom because of his powers and his military training.
Powers and abilities
Captain Atom's metal skin is tied into the Quantum Field, which enables him to absorb and manipulate theoretically infinite amounts of energy, the amount of which he can use is, of course, limited by his will power. If Atom absorbs too much energy at once, he is sent hurling through time. Depending on the type of energy absorbed, he either goes forward or backward in time.
This energy can be used for flight which is generally half-light speed, super strength (shown at times to be on par with Superman or Martian Manhunter), self sustenance and life support allowing him to live and even speak in space, fire and control energy of any form. He commonly manipulates his energy into force field bubbles, or explosive 'bombs', but the most common form is a simple blast.
Over the years, Captain Atom has become an expert at his energy manipulation and he can fire from any point on his body, although he usually uses his hands for ease of aiming. He can fire in multiple directions at once or from every point of his body at once. Several times he has "detonated", releasing a massive amount of energy at once, destroying objects within a certain radius. Most recently, he used this ability to destroy the city of Blüdhaven. On more than one occasion, he has used his ability to manipulate all forms of energy to prevent a foe using their own powers, such as the Ray (comics) and Firestorm (comics).
Captain Atom can also create matter in the same manner he creates energy. Originally, he needed a pair of gloves invented by Blue Beetle to do so, but he later learned to do so without them. In the same way, he learned to access weak force energy.
With focus and effort, Captain Atom can increase any of his abilities to the match the amount of will power he uses to gain it.
As of Captain Atom: Armageddon #4, Captain Atom has demonstrated minor atomic transmutation powers, as he was able to turn both Maul and Engineer back to their human forms. This power can be used instinctively or through concentration. He has also shown the ability to telepathically interface with computer networks in addition to those listed above.
In Captain Atom: Armageddon #7, Captain Atom has shown time-travelling capabilities without quantum jumping. Captain Atom states that through concentration, he can briefly travel ahead in time ("about a week or so"). The process is exhausting and the period he can interact in the future appears to be limited to a few minutes before he returns to the present.
Captain Atom's metallic shell, or "skin", is composed of a portion of the alien being known as Silver Shield, and is called Dilustel. Pieces of the aliens metal body were used in the Captain Atom Project, Project Major Force and similar projects thereafter. Nathaniel is able to coat himself with the metal, either partially or totally. Atom's symbiosis with the metal is such that even partially armored he is able to access the Quantum Field. The metal is almost totally invulnerable, resistant to various degrees of damage from energy, physical, heat, lasers, etc. It has been speculated that only X-Ionizer technology can cut the metal (such as the government's tools in the Captain Atom Project and the Samurai sword that once sliced through Atom's side).

Answer 2

Iron Man of course.

Tony Stark without the iron man armor would beat captain atom too.

Especially since he can heal better than wolverine now and most importantly his money makes him one of the most powerfull superheroes there is. Iron Man is probably the most powerfull hero in marvel after the extremis storyline.

Money is the strongest super power of all. It can buy a weapon or finance research on a weapon to neutralize anyone else.

Answer 3

Captain Atom of course, hes basically a nuclear reactor. Hell ironman has trouble with the radioactive man and hes not on the same level as Atom.

Answer 4

The iron man

Answer 5

Captain Atom, he controls the quantum field, and could transmute any armor into whipped cream if he chose to.

Answer 6

Captain Atom would win because he is atomic.

Answer 7

totally iron man