The hardest part for me in the Silva v Jones consideration, is the factory of longevity. Jones started as a flash but has been working to maintain his domination, Silva just has the head start on beating top tier fighters.
The biggest difference to me is personalty, where Jones although humble still knows how good he is and isn't afraid to say it. Silva carries himself with confidence, and after all the shit talking Sonnen did, still carried himself like a pro who KNEW he was the boss.