Brother Bluto version A is made with a Belgian Trappist yeast. B is a Belgian Abbey yeast, which is a bit less sweet and more appropriate for the beer: it was also more popular with our tasters.
Area 27: A is made with a London Ale yeast which is fruitier. B is a dryer American Ale yeast. Version A was slightly more popular but it was close, so version B may be brewed again with a different name (kind of companion brews like our Courageous Cat and Minute Mouse).