I have to agree with everything mentioned above.
The best B strings in my arsenal are on my (very recently acquired) Dingwall Super P and my MTD Kingston Super 5. Not entirely sure what string are on the Dingwall as I only got it 2 days ago but it’s taper-wound. The neck is a maple laminate (5 piece I believe) with bolt-on construction. The Hipshot ultralite tuners have been recessed into the headstock to provide an even greater break angle at the nut. The clarity of notes on the B string is pretty incredible!
The MTD takes an honourable 2nd place. Bolt-on neck, one piece maple this time, Dunlop Superbright Nickels, angled headstock.
As @FDC484950 says, it’s crucial that the bass has been designed with a low B in mind!