Two powerhouses square off in the Mojave Desert, free of obstruction and interference. This is classic Colossus, not Colossusnaut or Phoenix Force. Rhino is as he was an Ends of the Earth with the Midgard Serpent horn.
Battle starts 200 feet apart, clear line of sight.
Both are in character.
Fight is to KO or death.
Which brawler is the last man standing?
Edit: Please include an explanation why one would win over the other, it makes the debate more interesting than one word answers.