Having had from 110 to 142 in a whole lot of different brands, for consistent tone between all strings I prefer a Fodera nickel 120 B-string the most (on a 35 scale), I haven't tried the Dunlop SB nickels yet though. I hope their B-strings are as good as their E-Gs!
I don't want my B-string to sound different from the other strings, so when (like recently) I get tempted to try fatter B-strings again I always regret it due to the massive difference in sound, no matter how it is set up. Of course not in absurdum, you COULD setup a really thick string and make it sound wonderful on every tone, on a marvelous bass, with a great tech. But a lighter touch and really working your technique is more worth it to me, and easier to work with nuances later too of course.
And of course, cheaper.
Some people love the different tone from a low, massive string though! So it's really what you are after. If you only play the 5 lowest notes on that string, then maybe you want a bigger sound for those tones. For some reason.
Still, it's a lot cooler sounding really fat on as light strings as you can! Heh.