Right now, the only anime I keep up with every week is MHA and I'd consider it to be my favorite because it keeps my hyped every episode. I even thoroughly enjoy the fillers.
I've been waiting for One Punch Man & Mob Psycho 100 to come out with new episodes for years now. I enjoyed both of these, but I think Mob Psycho 100 beats OPM in my book and is borderline a favorite if they would give me more content to enjoy.
Blue Exorcist is also the first anime to give me tears in my eyes, but I still haven't watched the second part of the series yet.