I have never read a single manga. Anime is much more accessible; I'd have to actively seek out manga, whereas I used to watch anime series on Toonami and [adult swim] back when I had cable, I used to watch stuff on Crunchyroll before they were purchased by Sony and merged with Funimation and given a mandatory subscription fee, and there are a few series on other streaming services as well. As the saying goes, you can't swing a dead cat without hitting anime in today's market. It's everywhere.
That all said, I feel like I ought to make an effort to get into manga. As a creative, I prefer to experience stories as they were envisioned and developed by their authors. That's part of why I watch foreign language movies and most anime subbed instead of dubbed, because dubs can be prone to varying degrees of translators/adapters taking creative liberties with dialogue and such. I realize this is a bit of a poor argument since subs can probably be subject to such issues sometimes, but suffice it to say that if I were to learn whatever language a movie/series/book/etc. was in then I would simply watch or read it in its native language without any middlemen. Additionally, sometimes things from the manga don't get adapted when made into anime, like some aspects in Yu Yu Hakusho. That's one of my favorite anime series and I feel like I ought to read the manga to deepen my appreciation for the series I've loved for so many years.