Question: Which photo has the more correct White Balance? For me the second is much better than the first. My understanding is that the R+G+B histogram needs to be as balanced as possible. Is this true, or does it depend?

![Before and After](https://i.stack.imgur.com/ZICWl.jpg)

Answer: 
Without referencing a white object in your photo, we cannot decide which one has a better white balance. In short, white balance is process of removing unrealistic color cast on your image, i.e., correct the white area in your image that captured as gray. So it cannot be judged by histogram. If you know what part of your image should be white and the image is not affect by other light source, you can adjust the rgb balance in your image until the white part has a balanced rgb value.
The technically correct white balance setting is the setting that "cancels out" the color of the lights lighting your scene so that the color of items in your image is the same as the color in real life.

You can't judge white balance from the histogram or anything in the photo without some reference to that item real color (that's how the white balance "eye dropper" works - you tell him that the specific color in the image is actually white or neutral gray and it re-calibrates the entire image around it).

And finally, unless you are shooting products or photojournalism you don't have to limit yourself to the "technically correct" white balance, playing with white balance can create very nice effects (especially if you have multiple lights with different WB and you set them up intentionally)