Warm. I had to learn about this kind of thing when I started editing photos but essentially they make the standard setting on most displays very cool, or blue, because it tricks our brains into thinking the images is brighter. People then equate a brighter image as better because most people have just don't really think about things like accurate image reproduction and so when they have to make a judgment call on it they just go off how intense they perceive the image to be on the screen, which also explains why most people's first photo edits are almost unbearably saturated and contrasty.

The problem with the overly blue "standard" setting is that colors come out super unnatural and it's just one of those things where once you see it, you can't unseen it.