1. Both titles are based off of video game franchises
2. Both have plenty of sword and sorcery
3. Both have very good production value which can be seen in the action scenes
4. In order to fully appreciate, the source material should be played (in Fate's case at least watch the first animated series and do a little research on the visual novel)
Two game based anime movies, with awesome animation and lot of action where the fighting scenes are almost flawless.
The details are pinpoint accurate, with a decent amount of blood&gore.
Also it's helpfull if you played the game's or read a little something regarded to the games because it will maybe be a little hard to understand the story or to connect some characters with the main story.