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Level 16 introduces you to your new tanking elemental, the Earth Spirit. This guy is sturdier than either Wind or Fire, and can generate more enmity, but offers a bit less damage. Like the Wind Spirit, his damage is partially direct and partially
DoT. He's good to use in instances where you have to solo 2- or 3-pulls, or mobs of a higher level. In all other situations, stick with your preference of Fire or Wind.
In addition to Erosion and Stone Skin upgrades, you will also receive Dispel Magic and Elemental Replenishment now. Replenishment takes a bit of your health and transfers it to your summoned spirit, which is a pretty risky prospect unless you have a full HP bar. Dispel Magic will remove buffs from your enemies, making you much sought after in PvP.
For most pulls, try sending your Spirit in to attack, and follow up with an Ice Chain - Frozen Shock, then one - or both of your DoTs. If you chose the Spellbook, you can use your physical attack. If you're not in danger of pulling aggro from the Spirit, toss out a Flame Bolt - Blaze combo.