I like watching documentaries, I've recently found a YouTube channel called Real Stories. I highly recommend this channel because it has worth-watching content.
Science videos are also interesting to me. "It's okay to be smart" channel has many great videos about various science-related subjects.
I have yet to find a good channel in English with opinions on different subjects such as current issues, philosophy, society and so forth. I watch two Spanish-speaking youtubers that talk about these issues, Esquizofrenia Natural and Marginal Media. I like them because they approach different topics with such professionalism.