This really depends on the user's display and the viewing conditions. Someone with a TN LCD or even an OLED in bright light would likely prefer the "high contrast" #FFF on #000.
https://medium.com/@h_locke/why-dark-mode-causes-more-access...
There's a myth going on that dark mode is universally/objectively better which is simply false.
Display brightness at 20% is life. Never made sense to me why you’d shine the light of a thousand suns in your eyes then put sunglasses on it because “it’s too bright” when you could just not.
My partner is a dark mode user and honestly sometimes her phone screen lights up the whole bedroom. Even with dark mode. I don’t understand.
Low contrast is hell.
Black text on white background all day.