Solitude, b/c it's pretty.
Seriously though, Druids and Frozen for the tactical play available.
Favorite Guild Halls
samcobra
KycooGhost
Druids because of its setting, I love the forest, just not to bugs
Thizzle
Isle of Wurms.
Owik Gall
The desolation hall because it's a grim, yet awesome scenery. The background music enhanced the feeling of the desolation. It's barren, yet it's a prairie of wonders. Kind of the feeling a fossil digger gets the when there's a lot of fossils laying just out in the open. It's got an ancient, ghostly feeling to it that haunts you. Finally, there's the feeling I get like it's all past and the present is a grim out come. Those themes are really what I go for, and this one is right on.