out of the Charge line, the Super Charge is the strongest and hooks the most with the earliest rolling formation.  The weakest as in what? backend? overall hook?  Well the ball that hooks the least overall would probably be one you have, the power charge.  Although is you need a ball from the charge line that can handle oil a little better than the power charge (because of carrydown, or whatever) then the depth charge would be a good choice, although it is a low load particle ball so it will check up a little sooner than your power charge would but it would be great for carrydown situations and so forth.