With Jorgan, he likes a lot of Darkside choices. He's basically the "Yes sir, no sir" kinda guy. If the choice sounds like it's accepting of authority, and is a typical military kinda response, then he'll like it.
Vik is the opposite, which puts him at odds with any of your lightside choices. He hates authority, and likes breaking the rules, personal profit, etc.
Ultimately, no companion is "lightside" or "darkside" fully. At least on the trooper.