As an engineer looking at screens all day, I find Dark mode to be easier on the eye. it also has a very modern look, it's why I use it for my project: Lunch Flow (https://www.lunchflow.app)
It depends on user preferences, use case, and context of usage. Dark mode works great in low light, saves battery, and looks sleek, while light mode is easier to read in bright spaces. Let users pick or switch automatically for the best experience ;)
I like dark mode best, I wish Product Hunt had dark mode! Maybe it does and I can't find it. I usually search for it because as many mention, it is easier on the eyes for me.
Product Hunt