For me,Mufasa was the one true king.Kovu,even Simba doesn't look as much royal as Mufasa look.He was very wise and powerful.Nobody,even Simba or Kovu can change him for me.
Yeah he seemed to be one of the best Kings of the Pridelands. Simba was good, but like Kiara said he'll never be Mufasa. (Kingwise), otherwise Simba is awesome