To be honest, the "fun" factor of each class story will also be influenced by your Force alignment.
I found my DS aligned Sith Inquisitor story to be cliche and thoughtlessly evil. Yet I've found the complete opposite as a LS aligned Sith Warrior. Considering the SW's boss, the standard LS tactic of "take them alive" actually makes sense. Also there have been some really rich and interesting story opportunities that a DS aligned SW would have never chosen.