I hate the framing of this question because it frames it as a matter of preference, not context.
In the dark, in the middle of the night, on my phone, I prefer dark interfaces. When I'm saving battery power on an OLED screen, I prefer dark interfaces. When editing photos, mid-grey as a reference point is awesome. Interfaces built with that in mind are smart, not just showing off UI.
I like apps to look like themselves — right now the glut of dark mode apps are all charcoal grey with off-white, they all look like each other and rarely does their branding shine. It makes things hard to navigate. There's a lot more variety in light interfaces.
When it comes down to it, I prefer what's well thought out and not eyeball-searing in the middle of the night — I'm a huge fan of software that understands the use context not just treating dark mode as window dressing.
I generally prefer light mode but really really like Google Maps which switches between the two based on sunlight - pretty amazing and intuitive.
It really depends on the software I'm using. I prefer dark mode 90% of the time, but yesterday I opened up Apple Numbers with their new "black theme" and just couldn't handle it.
As @aredridel mentioned, I'm a big fan of Dark Mode if only for the fact that it can save a decent amount of battery life on OLED screens. So for my iPhone, I have dark mode on always.
For desktop/laptop I'll usually set it to follow the operating system theme, which allows it to change automatically based on the time of day. Certain apps, like Slack, handle this really well. However I will add that find dark mode on Google Chrome to be a little bit of a hassle as a developer. I'm used to a darker window theme signifying that I'm in "Private/Incognito mode" - which I use to to quickly test certain features without local cookies/storage. Chrome in dark mode is almost indistinguishable from the Incognito mode so you're forced to look for the little "private eye" investigator emoji to confirm!
Grafana has the best dark mode of most interfaces I use on a day to day basis.
I agree with @aredridel about framing the question in regards to context.
I set my mac to follow the progress of daylight as I move my working settings from open and well-lit places to my bedroom. My phone and tablet by default are set to dark mode since I want to squeeze all the juice that I can from the screen and if a true dark theme experience could give me lower power consumption (not very likely), then I will opt for it... battery life will always triumph in any mobile setting decision for me.
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