If you shoot raw then your choice of white balance can be applied non-destructively later. I often use a custom WB at the post processing stage, but when shooting I just use the nearest preset to the lighting conditions to make reviewing easier. I don't recommend auto white balance (AWB) as this can, and probably will, result in inconsistencies between shots that make judging and correcting unnecessarily complicated. AWB may be appropriate when the photographer is using a JPEG-only camera, has no idea what to set, and only has one chance at the shot. Otherwise, shoot raw and/or make a decision.