Aside of my all time favorite Ops (Code Geass R2 OP2, Rainbow Nisha Rokubou no Shichinin OP),
my current top 3 are:
1) Shigatsu wa Kimi no Uso OP 1n
2) Shigatsu wa Kimi no Uso OP 2 - I seriously love those OP's
3) Zankyou no Terror OP - fits it's show perfectly
https://www.youtube.com/watch?v=oc00ABaD4cI&ab_channel=J%C3%BAliaBergamo
Link for the Zankyou no Terror OP. Didn't find a good video for the other 2 OP's
Playing: F1 2016 (PC), Uncharted: The Lost Legacy (PS4)
Watching: Hajime no Ippo, Attack on Titan (4th time)
Upcoming purchases in October:
-TBD