I've played neither game, unfortunately. Part of me wants to answer that handcrafted is better, because it is better, but I also know that feeling of "what's next" from playing MMOs where you run the same content over and over. You get to that point where you don't really want to do anything.
I've also played games with procedural generation of content, though, that I didn't like at all. Dungeons where you're looking at the same content, just rearranged, bothers me for some reason. It messes with my brain's attempt to organize it. Daggerfall, especially, used to give me a headache, especially since the parts would often fit together in ways that made no actual sense. There was always this disappointment of going into a random ruin and seeing that it wasn't a set piece.
The key to procedural generation, I think, is to have a LOT of variety with the pieces and a lot of rules in place about how they fit together. If done intelligently, I think it has a ton of potential.
Looking back on things, however, I think my favorite 'dungeon running' was this instance I used to farm in WoW. I ran it a ton of times but it was always fun because it was challenging as hell. It was a 5-person instance for players around the 60 to 65 level but I ran it solo at level 70. I couldn't kill the bosses or large packs, so it was really dangerous sneaking around and taking out patrols and strays, but damn if it wasn't the best stealth game I've ever played. Because of that, I think running the same instance over and be fun, as long as it remains a challenge.
