Board Thread:Questions and Answers/@comment-7823447-20140421150120/@comment-26192378-20150311094723

lets just count the limits, powers n weapons of these two.

Captain America -

unbreakable armor, superhuman strength (can lift 1200 lbs), superhuman athletic abilities. combat experience. Can use human weaponry.

Limits - Bullets can penetrate. vulnerable to fire, electricity etc. Overall limited in every aspect.

Ironman - (Technological advancement based on movies so far MARK 42)

Armor(Resistive to high explosions, fire, electricity, Gamma radiation, radioactivity ), can lift 30-50 tons, Jarvis(Auto locking, Combat strategies, Guidance, Attack predictions, attack effectiveness, energy management, unprecedented reaction time n accuracy), tank missile, Penetrable Unibeam n Repulsor, one-time laser(can cut almost anything), Can fly at hyper-sonic speeds. Jarvis can operate it.

Limits - There are limits but can't be reached(even 10%) by captain america.

So even Jarvis itself can defeat him while tony is sleeping with pepper.