Most are masterpieces or near masterpieces, and hard to watch
basically anything with elements of fantasy, whether it be mythical creatures or nonexistent things.
This is a list of anime with English dubs that are found easily with a little research. Fan dubs are not included.
The ones that I get the urge to rewatch.
*in no particular order
basically this is when the protagonist (female) or a female character finds herself to have multiple people in love with her at once or throughout the course of the story.
Here are the deepest and most thought provoking anime I've seen.
My absolute all-time favourites. The first ones, to me, are the proof of anime as an art.