15 troll shaman: Guk, Unrest or Kurns?

[Hibbs]

I'd say Guk. I feel like its better xp than unrest and Kurns. It can be tough solo, but twinking / fungi will make it a breeze and the xp will roll in. 15 you can start at scryer and pushing 20 you can go down by the Lower Guk zoneline. getting 25-30 you could do the 3 way down by AC for still amazing xp.