Anyone who knows the fiction knows why Soth is LE, and his Star Wars analogy Vader, is CE.
Soth: Always keeps his word, never strikes before his foe can ready a weapon, never ambushes from behind, acts with (twisted) honor, while adhering to a code of conduct.
Vader: Never keeps his word, foes without weapons are the best kind, 'you were unwise to lower your defenses', is totally happy with stabbing people in the back (literally at times) acts with zero honor, no code and however his rage and anger dictate.