I think you'll find the consensus is to use AWB (Auto White Balance) and to make any corrections (if required) later in Photoshop (or similar).
Shooting in RAW mode (not something I do) allows you to apply white balance when extracting the image so you can then try various settings...and then again do any further adjustments in Photoshop afterwards.
I will sometimes (if it is either fully overcast or there is no cloud at all) use the corresponding white balance setting on the camera but have yet to see and obvious differences...
Or maybe I'm missing something...
Hope this helps!
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