He'd deal with Miller the same way he did Chisora imo. Ruiz would be more interesting with his hand speed
Ruiz is too stationary, and his gas tank is shot. Prime for prime I would absolutely give Ruiz the better shot at beating Fury than Miller, but I wasn't talking about chances. IMO Fury will have an easy time with both of them right now, but Miller would stylistically make it into a much better fight. Miller at the very least would get close to Fury, and push the action; Ruiz would get his ears boxer off from a distance.