¿Who is stronger, Colossus or Iron Man?

Colossus, also known as Piotr Nikolaievitch Rasputin, is a superhero from Marvel Comics who first appeared in Giant-Size X-Men #1 in 1975. Created by writer Len Wein and artist Dave Cockrum, Colossus is a member of the X-Men and one of the most powerful mutants in the Marvel Universe. Colossus' superpowers and strength are closely tied to his ability to transform his entire body into a form of organic steel. When in his steel form, Colossus gains incredible strength and durability, making him one of the strongest beings in the Marvel Universe. He can withstand powerful physical attacks, and his steel skin makes him impervious to most forms of harm. One unique aspect of Colossus' powers is that he can transform back and forth between his human form and his steel form at will. While in his human form, he retains his normal strength and abilities, but when he transforms into his steel form, he gains incredible power and durability. Colossus' origins are closely tied to those of the X-Men. He was recruited by Professor Xavier to join the team of mutants who were trained to use their powers for good. Despite his gentle nature, Colossus quickly became known for his incredible strength and courage, using his powers to fight against various villains and threats. Throughout his career, Colossus has had many memorable moments, including his romance with fellow X-Man Kitty Pryde, his leadership role in various X-Men teams, and his pivotal role in many Marvel Universe events. Overall, Colossus' superpowers and strength make him one of the most iconic mutants in the Marvel Universe. His ability to transform into organic steel gives him incredible power and durability, making him a formidable opponent for even the strongest villains.

Iron Man, also known as Tony Stark, is a powerful superhero from the Marvel Universe, first appearing in the Marvel Comics series "Tales of Suspense" in 1963. He is a brilliant inventor and businessman, and is one of the most respected and admired heroes in the Marvel Universe. Iron Man's story begins with Tony Stark, the son of Howard Stark, a brilliant inventor and scientist. After his father's death, Tony inherits his father's company, Stark Industries, and becomes one of the most successful and influential businessmen in the world. However, Tony's life takes a turn when he is captured by terrorists and forced to build a weapon for them. To escape, he builds a suit of armor powered by an arc reactor, and uses it to defeat his captors and escape. As Iron Man, Tony has access to a wide range of advanced technology and weaponry, including his signature suit of armor. The armor is powered by an arc reactor, and is equipped with a variety of powerful weapons, such as repulsor blasts and missiles. In addition to his physical powers, Iron Man is also a brilliant inventor and strategist, and has used his intelligence and resourcefulness to defeat many of the Marvel Universe's greatest villains, including the Mandarin, Whiplash, and the Ghost. Throughout his long and storied career, Iron Man has become one of the most respected and admired heroes in the Marvel Universe, and is a member of the Avengers and the Defense Advanced Research Projects Agency (DARPA).