The Landslide
[13] Hero
In reality, I think Demon's was harder. Dark is harder in different ways, but you are punished much, much more severely for dying in Demon's. By the time you encounter enemies who can curse you you should be able to plow through anything that is between you and the curse cure, so really it is just a time waster that results in you also getting exp along the way.Upon running into his first curse mob my brother had this pearl of wisdom to share: "Demon's souls was a hard game. It was tough but it was fair. But it's like they got such a reputation for being hard that by the time Dark Souls came out they decided to take out the 'game' entirely in the interests of cementing that reputation."
Also, curse enemies only appear in a few areas, and 3k is almost nothing to spend on such a valuable item. I got three at a time.