Cobb has already had a better year than Jones ever has IMO.
The best thing about Cobb is the best thing about every good slot guy. He has suddeness in his cuts, runs clean routes, good hands, and has a feel for leveraging defenders to find windows. As a bonus he's dangerous in the open field which can turn those quick developing underneith routes into big plays. As a bonus, bonus he can get you out of a game at running back or quarterback.