I almost never use two DoT when I root rot on my Druid. Unless you include Drones of Doom clicky...
The fire DoT at higher levels is vastly more efficient than the magic DoT. At your level the magic and fire are pretty equal.
However if you are root rotting that tells you you want to do stuff for 2-3 min and then AFK for 10 min waiting on respawns/mana while you do RL stuff around the house etc. Which means go ahead and be inefficient to kill faster then just have more downtime to do more RL stuff.
If you are at the computer the entire time you're playing, charm kill.
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