The part where the Mad Architect does that glass breaking move is one of the most stunning visuals in the game, combined with the sound, it's just goose-bump-inducing. Also, I really love the architecture in the boss room in the Vaults of Madness, the stained glasses are beautiful, and the mechanics of the fight are fun and interesting. The other bosses are cool too: the titan with his glowing flames, Grothdarr with his heavy attack with the satisfying 'clank' block sound, and I thought the story was interesting as well, and like Selene's Web, the Vestige was helping what turned out to be 'the bad guys' (plus, I really like the voice acting of the 'I'll figure something out, I always do' NPC, it cracks me up for some reason). For these reasons, I voted for Vaults, though I think Selene's Web is really beautiful too; the otherwordly feel of the nature, the tricky part of figuring out the path (and not falling in a pit if going the wrong way--because that dungeon is hard for the navigationally-challenged like me ), fighting the archer boss and Selene were both difficult fights, and the tank had to move aggro away, etc. while the group focused on different things. Both very well designed dungeons!

The back track part in Selene's web is a pain in the arse.

Tough choice for me but I'm gonna vote VoM. I just love Coldharbour aesthetic. Still, Selene's Web is how Valenwood should look like, it's pretty cool.

And Vaults of Madness vaults into the finals!