I have plenty of favorite openings such as Cowboy Bebop, Samurai Champloo, and Higurashi no Naku Koro ni Kai. But if I had to pick some favorites, it would have to be Toki wo Kizamu Uta from Clannad Afterstory because it leaves me with so many feels
and Aoi Shiori from Anohana because indie rock is rad
. As for closings, mine are probably from FLCL and the first closing of Shokugeki no Souma. The Fly me to the Moon cover was also pretty good from Evangelion.