Samus and Iron Man have very similar types of attacks that they can use against each other. However, Samus has a trick up her sleeve that Iron Man would never expect, just as he thinks he has her defeated, suddenly, THIS happens:
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Samus has restored all of her energy at the expense of a few bombs and missiles. Now she has the advantage because she's back at full health. Whether it's the Charge Beam, Missiles, Power Bombs, or even the Screw Attack (lol) that she chooses to attack with.... She can win. Samus can withstand anything Iron Man tries to attack with as long as she keeps enough bombs and missiles in reserve to be able to Crystal Flash again. This skill will keep her in the fight until she wins.