There are many people with superpowers, and they are often ranked by how powerful they are. Different heroes such as Captain America and Iron Man have different ranks depending on who you ask.
Captain America has a power ranking of 170 out of 400 according to the Avengers wiki page. Iron Man also has a power ranking of 170 out of 400 while Hulk’s power ranking is depicted as 160 according to the same article from Wikia. Cosmic Armor Superman is depicted at 440 which means he is one rank higher than both Captain America and Iron Man when considering sheer levels of raw strength alone.
The cosmic armor that Superman possesses gives him ultimate control over time, space, living energy, souls etc., so it makes it hard for other individuals in the universe to match him in terms of power, assuming he is used correctly.