Jones has completely dominated every grappler he has fought, usually with his grappling. Bader has great wrestling, but I don't think he has the same versatility as Jones when it comes to grappling. Bader relies on that overpowering double leg and control from the guard, while Jones mostly uses a variety of highly technical throws and has shown a lot of skill in passing the guard.
I think Jones has shown himself to be the more athletic and skilled fighter, but Bader has a style that can nullify a lot of that. Also, a win over Nogueira is bigger then what Jones has managed to do imo.