Actually Johnson has gone sub-10.3 in the 100m and sub-6.7 in the 60m so Johnson is actually faster. OTOH Patterson is a good deal more elusive in the open field and is still very, very fleet. As a matter of actually playing the game of football I'd take the latter.
Wait, don't you mean "the former"? Or are you actually saying you would rather have Cordarelle Patterson than Andre Johnson?