So, you've played both of these great games. You've died... countless times, and yet prevailed. Which one do you prefer?
Please motivate your answer.
I'll go first. My favourite is:
Why? Because it was cooler, basically. Examples:
Losing your soul and having to recover it is cooler than going Hollow and eating Humanity
Nexus vs Firelink Shrine, lol nuff said.
Separation of worlds was cooler than open world, it felt like you were a prisoner in that world, alone and screwed.
Boss fights were rare and felt special in Demon's. In Dark Souls it feels like you're fighting some kind of boss every two seconds.
Not really fair to point out when comparing to a sequel, but Demon's Souls was a completely new experience, wow-factor.
Performance issues were not as widespread in Demon's as in Dark. Going to Blighttown is a torture of 5-10 fps for long periods of time.
Less stupid glitches that ruin PvP in Demon's.
Dark Souls can be very cheap at times.
I prefer the more linear level design of Demon's.
Obviously Dark Souls has its positive elements as well, but since the point of this thread is to list why you prefer one over the other I won't go further into that.
Conclusion: Demon's Souls is still my undisputed favourite game evar.