Overall who's better: Leonardo DiCaprio or Robert Downey Jr.?

My friend and I are arguing over this. Obviously, it's Leonardo DiCaprio. And it's not just because he's older than 30 and still hot. But it's because he is such a phenomenal actor! Yes, I've seen movies with Robert Downey Jr. in them but they just aren't as good. So, I need to prove to my friend that Leo wins. So, help me out? I need some guys to vote for Leo too.