I have a female Bolivian and she's my favorite fish. She comes to the tank front to watch me and beg for food. She's very cute and is always exploring and playing tag with the cories (even if she confuses them when she hides behind something.) So I vote Bolivian
I, however, don't have experience with German Blues. I tried to get one, but they had both in the same tank at the store and they netted the wrong one...