I enjoyed them all, but Asylum was my favorite by far. It struck a perfect balance between being a tight, contained experience, while giving you a great set of tools to deal with things as you saw fit. It was claustrophobic in a great way, and you felt like an apex predator when you figured out how to work within the constraints.
The rest of them feel excessive in comparison, both being too open and giving you too many tools to work with. I never felt like I could get into a "flow state" with them like I could with Asylum.