maybe there are a lot of treads but I usually read them all. I find always interesting what people think about this.. I'm not settled at 34", but I'm trying to achieve the best possible B string at 34".. if I won't get satisfied after a couple of years, then maybe I go up to 35" or fanned fret, etc...
another factor (at least, for me) is not the B string by itself, but the whole string sets evenness.
I know that many people use light touch while others (including me) like to dig in more.. I think everyone can accomodate a slightly different technique (okay but why should, if not necessary thats another question). For me, its better to use an equally tensioned string set where all the strings are a little floppy than a good stiff set with a floppy B. I can adapt easier to the first. We could talk about floppy E strings as well, and Im sure we would, if there were only EADG stung basses
So I think, the strings play a great role in this. Neck construction and the overall construction play another BIG role..
Why Im experimenting with 34 basses at the moment: I dont want to stretch my fingers more

And I like the other four strings at 34. If I would use lets say 35, I would use the same .135 B string with a bit lighter high strings, because they would get stiffer as well on the longer scale. Unfortunately, there are much more choises for light high strings, than heavy low strings :-(
I think, it is hard to make a good-sounding, playable, long-lasting (and dont know, how many requirements are there above these) H string. I would like to talk with string manufacturers, I think, they could say many-many interesting facts on this