Seems like people like BB more since it caters more to offense and there's no adverse effects to carrying a heavy @** weapon. Dark Souls 3 is longer imo with a more varying environment, more secret areas, tons of weapons and different classes. The difficulty spikes are all over the place tho, some of the bosses are super easy and then the next will make you rethink your entire style of play. I also like the way chimes cast spells on swords vs the paper from BB, not to mention magic swords had a big impact on bosses whereas you could get through BB no problem without it.
IMO, Dark Souls 3 feels like a true journey, I felt like I had been all over the world and back by the end of the game.