I dislike both of these terms but putting that aside, an anime I think is underappreciated is Chibi Maruko-chan: My Favorite Song. That film is phenomenal and everyone owes it to themselves to watch it at least once in their lives. In contrast, I very much dislike Evangelion 3.0+1.0, even though it is widely loved and embraced by most Eva fans. That's a story for another time though.