u/Hot-Entertainer-7859

Guys I have been playing SWTOR for like a few days now (approximately 5 days). I picked Sith warrior-sorcerer at first but I didn't like it so I deleted that and created another one with Sith warrior-juggernaut.

I am level 15 currently and I am in a dilemma and I don't know what discipline I should choose. I am currently using vengeance. Should I change to immortal or rage for better performance? I only want to focus on completing the story. Please help me. Thanks in advance!