It really comes down to your playstyle. I play an enhancement shaman solo, his spell lineup will be different than a resto or elemental shaman. (I rarely use lightning bolt for example, ele shaman live by it) Some shaman probably pull with flame shock, while some might prefer to just burn with only lightning bolt. So basically like contents it boils down to playstyle, do you map spells to keys or just use your 1 to = bar for spells etc.