. . . I tend to prefer taperwound B strings, but non-tapered can sound good too.
It's probably been mentioned, but intonation is especially critical on the low B. With a good bass that's been properly intonated, you can play low B string even above the 12th fret.
It is my experience that these two go hand in hand. I very much prefer a tapered B. While I do think it rings more truly, it is mostly to support the second statement.
In my experience, it is much easier to accurate intonation with a tapered B string.
