I found that the sith inquisitor has the best storyline and is a lot of fun to play I was really let down by the Jedi Knight lvl 1-14 thank God I stopped there because the other classes are so much more fun to play my roommate and I found the empire classes to have more interesting story-lines and story characters/elements My roommate's favorite classes are the trooper and gunslinger though to me the combat felt wonky for a lot of the classes except sith inquisitor but regardless of how wonky the storylines might cater more to your preference I would try multiple classes and see which storyline draws you in the most before sticking it out to 50! GOODLUCK