Rain Man - Is Crews Better Than Duston Hoffman?

Rainman: I don't think that he's shown much of an interest in playing any other part than tom crews in the last 20 years. He doesn't transform, unless he really transforms, like in tropic thunder or something. Is he a good actor? I just don't think he challenges himself in the way that he used to. Who is going to maintain relevance? Which is what people say most people say about Rain man.