T'Challa is both equally King of Wakanda, getting an active position in his country's affairs, and Black Panther, the Wakandan people's protector. T'Challa has experienced all his lifetime to be the Black Panther, but Erik is an experienced elite unique ops commando. The trailers do expose he obtains his very own variation of the Black Panther fit at some point. He has no this kind of lineage in the comics, which was a plot place.