I prefer Inferno...
The special ability of Pit Lords isn't that easy to use correctly, but with the right tactics and strategy, they allow you to accumulate Demons in your army, and an extra unit won't hurt.
And Dryads are also not bad...
However, the best role for Dryads is to serve as cover for Elves. And their special ability – to fix any attacked creature in place – is very useful. :-)
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