Air mana (which the Elves start with putting them that much ahead) allows Maelstrom which does collateral damage and doesn't need much in the way of node building (the Ljos can get away with one node). The Pact of the Nilhorn can give Elves the three hill giants Kael, JStrange and Sid (aka Larry, Moe, Curly) for another arty source.
Fire is fun though and needs less micromanaging, and fire elementals more amusing than air elementals, imo if there are plenty of available nodes one could use both Fire and Air, if there are few nodes, I usually go with Air, if an in-between # of nodes, I have a slight preference for Fire.