Who is was/going to be better in his prime, past Kevin Garnett or future Dwight Howard?

That's tough since they play different positions. Garnett, despite the popularity of Howard, was far more accomplished at Howard's age. Howard's game is something that won't be around forever, were as Garnett's style of play doesn't rely on athletic ability as much as it does finesse, therefore Garnett will be considered a better player 25 years from now.