Classic dark theme FTW. Modern dark is alright, too.
I use dark mode / black theme for everything. Every website or app I use i immediately look for the setting or preference option for night mode.
I've also installed dark theme plugins on browser for YouTube. It's a lot easier on my eyes, and I think every platform looks better with a black or grey background, even Instagram. It's also odd to me that people still use light theme on Twitter when the new black theme is way more aesthetic.