It's just a matter of what you want to show in your image; the Pleiades portion in the documentation is a perfect example.I don't understand why there is a white balance/reference dropdown.
If I wanted it to be made 'pretty' I wouldn't be doing the calibration in the first place.
from what I know white balance/reference is only in case the light source on a object you photograph isn't what you want it to be, so you change that in post, but never when the light source is what you photograph like in astrophotography.
When calibrated I want them calibrated not be 'post pretty' again.
So what do I need to select to make the white balance an empty action?
It's the same as in normal photography; if you have a warm light and a cold light in the same frame, you have to choose which one to make white - or find a balance between them.
If this doesn't interest you, then use the default; average spiral galaxy.