I would say Demon's Souls WAS harder. I don't know about now that the servers are disconnected. In Demon's Souls you have to deal with something called "world tendency" which determines a ton of NPC locations, objective availability, and difficulty. Depending on a combination of how many times you died, if there was a living boss in the level (Demon's souls isn't an open world game like Dark Souls 1 & 2, there were 5 or so different levels that you would warp to from the Nexus), and then an average of what EVERYONE else in the world playing the game was doing, you could be fighting enemies at like half HP or everything in the game is essentially a mini boss. Also, if you want to get the Platinum trophy in Demon's Souls, you have to play through it twice, which is kind of lame. It is a bit shorter than Dark Souls though. I liked the lore and endings of Demon's Souls better also. Try it out. It's not like you're gonna play King's Field.