Constantinople was one one the main places they wanted to conquer. After they conquered Constantinople and some other places near Europe. He made the capital Istanbul.
After Conquering Constantinople he expanded into the roman empire too. When he conquered all that he became pretty respected in rome.
Suleiman didn't waste any of the time he was given he send his military to expand his empire. One of the main things he wanted was a united empire.
The time he had in power he went first to the weaker areas to conquer and had aggressive warfare which led his time to a"golden age."
I think that Suleiman was a better leader because i think he did more with his power and expanded it and took more power. I know that if i was in this time period i would rather have Suleiman as my leader. I think he did more conquering and united everything.