Demon's Souls
+ Better atmosphere
+ Nexus
+ Level and update system
+ More challenging
+ Better integration between levels
+ World Tendency
+ Dedicated servers
+ The fear when anyone invades your world 
There are nothing to compare here... the feel of Demon's Souls after each win (even normal enemies) is the best thing I have see in a game... I loved the first tie I played it... I loved wasting two hours to kill the red dragon with arrows... I love each strategy that I created to kill any enemy or boss in the game... I loved to die over and over again.
I hated (but I loved too) to lost my last 2 hours os play due a Black Phantom killing me in my own world... motherfucker players arround the world .
I loved the possibility to kill anyone in the game... any NPC.
I loved to kill zillions of Dual Katana Black Skeleton to drop one Pure Bladestone to make the last weapon for platinum... that's with 99 LCK and the weapon to drop more items.
Platinum. NG++++. Over 200 hours.
After all the only thing that remains is the PURE and TOTAL SATISFACTION.
