How does Penumbra compare to Amnesia?

[The Rock Worm]

As I've found, Amnesia: The Dark Descent is scarier than Penumbra, but Penumbra has more of a story (and can be scary too!). Seeing that Penumbra is split into Overture and Black Plague, its story is longer. Both Penumbra and Amnesia have great puzzles and challenges to get past. Penumbra Overture, being the first, actually had weapons. every game since then has removed this option.