From Software is one of my favourirte developer and have produced incredible games starting from last generation with Demon's Souls. But Team Ninja has also made a agem in the same vein yet different in its own way with Nioh. Which one is your favourite? My favourite is Demon's Souls due to its hub style of level design and the amazing atmosphere and soundtrack.

Having played Nioh, so I can't really comment with that one in mind.

As for the rest, I'd say Dark Souls. It has some brilliant dungeon designs (with the only downside that, unfortunately, Anor Londo exists in a separate hub/screen, so to speak, so it's not entirely entirely connected), truly memorable bosses and leaves you with a sense of achievement that's just pure enjoyement. Also the game is rich in several departments, such as lore, customization and the likes. It has its flaws, but for me it's just the one that strikes the best balance on everything while actively being fun.

Second one would be Bloodborne. The only reason Dark Souls is first for me goes with the fact that I played it first, as I think Bloodborne's strengths are equal to those of Dark Souls (and coincidentally, they share very similar flaws).

The original Dark Souls imo.

Dark souls 3

Nioh

Well, I've only played Demon's Souls, so Demon's Souls. Awesome game.

1. Bloodborne
2. Dark Souls 3
3. NioH
4. Dark Souls 2.
5. Demon Souls
6. Dark Souls

Lord's of the Fallen /s

1. Nioh
2. Dark Souls 3
3. Demon's Souls
4. Dark Souls
5. Dark Souls 2
6. Lords of the Fallen

Didn't play Bloodborne.

Haven't played Nioh, and only beat the first boss of Dark Souls 3 so far.

IMO, DS1 > BB >>> DS2