Different strains have different characteristics, but it also depends on the base cheese - you need high moisture to create the brainy look.
"Geotrichum 17, 10 doses: Geotrichum Candidum 17 is a mold-like strain. Works great for combination with Penicillium Candidum; great for traditional lactic and bloomy cheeses. It is ideal for the creation of “brainy”/”wormy” looking rustic rinds. It has more texture than Geo 13 and Geo 15 yet has similar flavor strength. It has a similar white color, proteolytic activity, and optimal temperature to Geo 13 but it grows at a faster speed, more like the Geo 15."