Re: A thought about Snow WB
I've pretty much have completely gotten away from using the AWB setting. The problem is, just as with the in camera exposure meter, you are relying on the camera's electronics to look at the scene and pick a white point, but when processing how do you ever know what the white point actually was set to ?
Unless the lighting specifically requires it, I keep my camera set to Sunlight all the time. A great tool to then set the white point is a WhiBal:
WhiBal White Balance Reference Video Tutorials by Michael Tapes
Re: A thought about Snow WB
To my mind, the main thing, when viewing across several images, is to be consistent.
For a one off, which maybe all we see here, yes Whi-Bal, snow or even an Auto-WB that works, or is tweaked in PP is fine, and of course the Whi-Bal shot can be used in PP to set it correctly.
When shooting RAW and using ACR, even if you don't batch process, you can note the colour temp in Kelvin (and tint) being used for a good result, then apply that to all shots in same series. I guess this is just an alternative to using the Custom WB in camera method (e.g. if you didn't do it at time of shooting).