So I've played all story lines. It's been a while, but I liked the trooper more than the smuggler. The smuggler was ok, not too bad. If you are just playing the class quest, I don't remember there being a lot of force users involved. Next statement is about operative story line, didn't know if it would ruin it for others or not.
If you are playing the main story line like the planet quests, then going through to revan and so on, I don't think a smuggler or a trooper make sense.