 If you liked Shinseiki Evangelion Movie: Air/Magokoro wo, Kimi ni |  ...then you might like Shingeki no Kyojin: The Final Season - Kanketsu-hen |
These are the finales of their respective shows which are considered to be cult classics amongst the Anime community. (Unironically, was also split into 2 parts). Both are a culmination of stories about humanity's struggles of survival & tragedies in a world driven by power balances and doctrinated politics & ideologies. Mutual enemies are established in their respective worlds; due to a convuluted history with implicit narratives that become the catalyst for many countries to wage battles & war; whether by opposing nations or a common 'enemy'. Genocide and an Apocalyptic-Cataclysm occurs under the hands of protagonists whom suffer from the realities of the world built
End of Evangelion and Attack on Titan Final Chapters both deliver intense and thought-provoking experiences that fans of one are likely to appreciate in the other. You are in for an emotional rollercoaster if you are captivated by their despair-filled narrative and post-apocalyptic struggles.