Are you looking for the most accurate white balance in Aurora HDR? Be sure to try out the White Balance Tool.

In the HDR Basic controls, just click on the eyedropper to activate it. 

Now mouse over your image and find an area that should either be white or a neutral gray.  Click, and a new white balance is set for you. 

The temperature and tint sliders will adjust to try and neutralize any color cast issues and give you the most accurate white balance.

Learn more about the HDR Basic filter here.