Just as Babe Ruth changed the direction of Major League baseball by himself . . . weren't his 50+ homerun seasons something like triple what had preceeded . . . Wilt did the same for the NBA.
'Best' is an ambiguous term. He was certainly the most dominant.
George Mikan was the first, Shaq the latest. But Wilt's scoring averages, 100+ point game, and overwhelming rebounding stats put him in a category by himself.
Even his sexual stats were in a league by itself, but that's another story.