Fairly easy choices for me (unless I've shamefully forgotten something awesome);
OP - Attack On Titan opening 1 (Built the hype for each episode so well! Heart-thumping bombast! Shame the full version didn't keep up that energy and momentum throughout the whole song...)
ED - Kyoukai no Kanata (Uber chilled and just really nice (best part of the show which usually isn't a good sign ;_; ))
(Oh! Runners-Up would be the GJ-bu OP and the Purely Sky (Kirara's) ED from that too.
Oh oh! And the adorable Kotoura-san OP too! Kushi-kushi-kush!)