Lots of weird advice in this thread. The LHT and the Troll are not remotely the same bike.... One is a mountain bike and the other isn't, even if both are good for touring.

For an adventure bike, go with the Troll. The surly frames are not that overbuilt, comparatively, and not too heavy. The disc brakes will be a nice thing when the weather is bad, even if they get a little loud. And ultimately, the frame offers a ton of flexibility, like singlespeed, rolhoff, etc. options.

I like the Piolet, but the dropouts are a little fancy for my taste (worried about durability) and the price is higher than the Troll without seeing a clear reason why.