For fun :

Demon's Souls
Dark Souls 1
Bloodborne
Dark souls 2

Difficulty, all the same for me, its just some souls farming and you will get the end ^^

1. Bloodborne
2. Demons Souls
3. Dark Souls 1
4. Dark Souls 3

Well I've only played a few hours of Dark Souls and so far have only played about two hours in Dark Souls III but so far I think it's pretty incredible in every way. Not so difficult yet (only just past the first boss), but I know that will definitely change.

Either way, if the start of the game is anything to go by, then Dark Souls III may be my GOTY.

I havent played it but no way in hell its going to be better than Bloodborne for me.

Interesting, you prefer less BB because it is easier than the rest or for some other reason?

How can you know before having played?

Other than the game not being exclusive to PlayStation...

How can you possibly know that without playing it? Although if you go into Dark Souls III with that mindset then you're right, it won't be better, because you've already decided that it can't be.

Setting, art sytle, no chalice dungeons (less content) 

1. Bloodborne
2. Dark Souls
3. Dark Souls III
4. Dark Souls II
5. Demon's Souls

Dark souls 3 falls at the wrong time for me. Why do they release this in spring, that's the worst time for a grim and dark game. I'll pick it up in November if there aren't too many other games competing for attention.
I did pick up Ratchet and Clank today, colors!