Yes, because Demon's Souls is the better game
I'm curious why you feel that way. I just got into the series (I played about four hours of Demon's Souls because of PS+, then bought Dark Souls on Steam and have played about four hours of it as well), and, after reading about a lot of the systems in Demon's Souls and how they were changed in Dark Souls, I wasn't even interested in playing Demon's Souls anymore (and I'm usually a sucker for playing games in a series in order of release first). Most of the way things changed in Dark Souls seem like the way they should've been in the first place.
I like the atmosphere and level design in Demon's Souls better as well as the bosses which are on the whole a lot more clever and better designed. There is nothing in Dark Souls, to me, that matches the tension in certain levels in Demon's Souls. I never really felt any sort of tension in Dark Souls. I think Dark Souls is good up until you get the Lord Vessel at which point it can fuck right off.
I think tension is the biggest distinguishing factor between the two games. Getting lost inside the claustrophobic wormholes/bugbear maze is horrifying. Hearing Lord Rydell's screams all throughout the Latria prison puts the hairs on the back of my neck on end. There are moments when you first play through Demon's Souls where all you can feel is absolute despair. I feel like Dark Souls replaces those with moments where you think to yourself, "well, where am I supposed to go now?". The feeling is just not the same.