I beat both games, Demon's and Dark Souls, with exactly the same weapon in both: the Uchitagana. The Black Knight set was waaay too heavy for my character, and I think that dexterity > poise.

If you had a weapon with "S" factor in Dexterity (like "Hiltless" in Demon's), you could build with Dexterity and have equal measures of Damage as a Black Knight Great Axe with Strength Build. Mind you, it is not that the game cannot be finished (or even played) with another weapon or style. It's a frail detail that many people did not notice. It is just that Demon's did not have a "mega-weapon". Damage varied even because of tendency. In Dark, for a long time, all you could see was people dragging the axe behind them.

Hiltless was crap. It hurt you whenever you swinged the damned weapon :P

My favourite strategy was bleeding-out enemies. Something you can achieve with Uchitagana pretty easily. I tend to win some PvP battles thanks to bleeding-out the rival.

Of course! Everyplay has his/hers prefered strategy and each and every one of them work. That's part of Souls game magic. "Presenting" your theory of the game, your interpretation of the rules, controls and attack/defence mechanisms and gradually rise to the top. A low human husk rising to be "god" or whatever, through seer work, effort, failure and repetition. In reality: a human player proven to be better than another human player, through work and patience. That's the common "story" in both games. Pretty Japanese I think (considering their educational system and high competition on job field). Also a major difference from western RPGs, where the protagonist is a Messiah, a Chosen One, a Demigod etc, always in slumber. 

See normally I would but the games are so similar to me that it's just overall a strange thing seeing a demon souls 2 while were about to get a dark souls 2. Don't get me wrong if it does come out I may get it depending. 

Oh, I don't get you wrong at all. It seems weird to me, but I love those games and I can't help it but shout "Yayy!". Another reason for my enhtusiasm is this: I'm getting Dark Souls 2 this March, all very well done. Play the game for a year and so and then... Demon's Souls 2 hits the market, just as I am about to make the next gen jump. Normally I'd have to wait a couple of years for Dark Souls 3, so why not play another souls game in the meantime?

Thats a very good point. So long as the releases aren't to close ill probably feel the same as you. 

We can only hope. If it is announced this November, I guess it will take a year or so before it hits the market. :)

If it's not true (at all), then please suggest an "S" factored weapon for dexterity and luck build.

Which wasn't the case in Demon's as well, but that is not the issue. You claimed that what I stated was not at all true. When asked to prove said claim, you said that you don't know, because you don't play those builds. Demon's Souls had a representative - if I'm allowed that term - of an "S" factor in almost every build (if not all). It had even one for character tendency. This is not a gamebreaker. "S" does not beat anything , as you very correctly stated. Yet, it provides variety and balance.

Think about it: Why only have the Moonlight Greatsword - an "S" factored on Intelligence - and not something in other categories? Wouldn't that bring variety and choice of play? I had a friend with maxed out Green bar and pathetic Blue and Red correspondingly. He wielded two "hiltless" katana's making his initial stroke swift and nigh terminal. If he landed a blow first, most of the time he won. If not, he got killed easily. Yet, it was his choice of play and should be respected.

Anyway, I feel it is necessary to repeat that this trivial fact does not make a game better than another. It is just an answer - in good spirit - to the fellow some posts above who claimed that none can never find any (or other similar absolute expressions) elements in the first game that are better than their corresponding ones in the second.