I would just like to know what the definitive "best" B string is, since it seems that so many think the Fender B is "meh".
I've owned Spector, G&L and Ibanez 5 strings and played many others, including MM and Wick...none of them had this "amazing" low B I keep hearing about.
My experience as I already noted is that an older Fender V is "meh" unless you fix it. Late model Fenders seem quite nice but not up to that mythical level you are seeking.
I own three G&L and the B strings are quite good on them. I've got two Ibanez SRs and they are pretty good too. My (fixed) Fender Jazz V is pretty good now too and my Squire P/J 5er is also excellent.
So what is this mythical B string? It's a B string that does not feel floppy. It's a B string where 5th fret E sounds identical to open E on the E string. It's a bass where as you go down the strings from the top to the lowest open B note, the tone and character of the notes stays the same from string to string and sounds like its all the same instrument so you can't really tell if the note is on the B string higher up or another string lower down. All this is the "test" when you buy a 5 or 6 string bass.
I've got exactly ONE bass that lives up to this "to die for" B string. It's my Modulus TBX 6er. And not only is all the above true but there are NO dead spots and the tone simply cuts the mix like a hot knife in butter and I'm not exaggerating about it. It's obviously a carbon fiber neck and also 35" scale.
But let me say also that my Ken Smith and my Alembic 6 are VERY close the Modulus even though they are 34" scales. Hey, my Conklin Bill Dickens 7 string is up there at that level too. All the rest are still very good. My G&L L2500s are my main axes and there are no complaints there, but they are below the "mythical" level. I don't keep basses with "meh" B strings. I either fix them or sell them. Hence my Fender basses now fixed are no longer "meh".
But that doesn't change the fact that for a mythical "To die for" B string Modulus for me is the one. I don't own nor have ever played a Dingwall but I'd guess those would also be great candidates for a "to die for" B string. Also I have played but don't own a Pedulla and in my opinion that one might also reach mythical levels.
Probably there are some more, especially in the high dollar range.