Bloodborne just barely edges out Dark Souls III as my second-favorite game in the series behind Dark Souls. In fact, for a while I preferred DS3, but eventually I decided that I like BB just a little bit more because
- superior sound design, particularly the weapons
- amazing art design, rich environments created from a limited color palette (although with certain ReShade mods, DS3 can look incredible, too)
- incredible soundtrack, best in the series (followed by DS3's)
- more fun boss line-up: this one is kinda subjective, but I feel that even BB's weaker bosses like Celestial Emissary or Micolash can still be enjoyable in their own, dumb way, whereas certain of DS3's bosses I simply hate (Cursed Greatwood, Wolnir). Both games have a selection of standout bosses, though.
- more interesting story/lore: this game is what got me into Lovecraft
- the combat, while I don't think it is inherently superior to that of the Souls game, feels more balanced against the enemy and encounter design in Bloodborne; in DS3, occasionally the pace of combat feels at odds with certain other mechanics
Overall, Bloodborne feels like a slightly more polished and cohesive visionary product than DS3. The latter game, though, does boast
- far better role-playing: between the many more different weapon and armor sets, more fleshed-out covenants, more numerous and complex NPC questlines, and overall greater build variety, DS3 offers the player much more to work with for creating unique characters and roleplaying as them through the game
- superior level design (not world design, mind)
- much more sensible and better-designed upgrading system
- better multiplayer
- 60 FPS with flawless frame-pacing and higher resolutions if you so desire (and no God-awful shitty chromatic aberration to boot!) make Bloodborne feel like crap in comparison
At the end of the day, though, they're neck-and-neck for me. I've spent virtually an equal amount of time playing both (~400 hours).
Bloodborne is by far the better game in all aspects, including difficulty. DS3 was not good honestly.
Why do you think DS3 wasn't a good game?