What I think personally is that despite the slight difference in scripting between the GLM Core and the GLM module, the result will still be the same.
The difference in scripting is more about how the custom is driven. As in if GLM Core is chosen, then the custom is driven by the Core and the other modules follow it. But in the end, masculinity is masculinity whether it is a Core or module, and the result is that you become more masculine.
EDIT: the support answer given a few posts back is 2 years old and I wondet if some things have changed a bit. It is a good idea to ask Support again regarding this to verify.