Vault of Glass. Best design, looks great, is big enough and feels like a journey. VoG allows some exploring and is not glued together from miscellaneous parts like CE. I hate Destiny's non-story and the decision to put it into CARDS on the internet, but VoG made me at least interested to look at the lore involving the place. Bonus points for allowing some unexpected co-op action from Patrol players at the entrance, which is the only nice thing that can happen unexpectedly in this "seamless online world". Nothing comes even close. PoE can't even be mentioned in the same sentence, it's fun at times but it does not compare to a good raid.