YES TOKYO GHOUL. I've been following the anime and manga since 2013. I love how psychological it is and how it's inspired by Kafka's Metamorphosis. (Beautiful short story it is.) I watched both seasons twice or thrice already, hehe.
Zankyou no Terror is one of my favorites too, it's just so...damn. No words can describe how resonant it truly is. Really shows how terror truly works. I couldn't stop singing Dare ka, Umi wo for a week. Same goes for Unravel; I memorized it in three days. :3
One of my all times though, besides Tokyo Ghoul, is Deadman Wonderland. It's a gore fest with a truckload of philosophical questions and really messes up one's head. I've watched it all twice and read the manga. xD