Ok firstly worm u are wrong. U never get a dtw for assn in EE even if the defender has zero troops. Assn always go through. No dtw period for them. Now attacks will render a dtw if the opponent has no troops, but again, assn will not.
Also why this theory of sct's giving you a better chance at a KO? That's just so illogical I lol at it. KO is gained by zeroing both opponents bars. Assn are more effective to that end. Scts use less of your spies, but also take less of the opponents spies. So if you are takin 10k spies off an opponent with scts but I'm taking 21k with assn, who theoretically has the better chance at the KO?