SarkneySpy
Cadet
Jack and Sloane both have their own sneaky ways that are completly different. Who do you think can pull off manipulating people better?
I think it's Sloane. Jack can be quite ruthless, but even he does not have Sloane's unique brand of sociopathy. That's why Jack hasn't been able to get the better of him even after all this time.
They're both pretty sneaky, but I reckon Jack has mroe to lose through being sneakier than Sloane -- not only his life, but Sydney and Sydney's trust. Sloane doesn't care who he tramples on to get what he wants. Jack would.