Shinsekai yori, Kiseijuu: Sei no Kakuritsu Recommendations
Two competing factions battle for survival. In both of these series it is humans vs some kind of perceived monstrous being. However, soon you realize both are simply vying for survival, an instinct every creature has. This further blurs the line between good or bad. Although I think Shinsekai yori does an immensely better job at this than Kiseijuu does, there are parallels and in the end you wonder who is the real monster.
The most similar thing about these two shows is the question you ask yourself after watching them, they both makes you doubt humanity.
The difference is that kiseijuu is more of an action show while shinsekai is more dark mystery theme and unpredictable turns.
A fictional form of specie with sense of reason revolts against humans, who are more superior than them, as they believe humans are ruling the world with tyranny.
Shinsekai Yori is set in the very far future about 1000 years from now and people have psychic powers. The children think they live in a utopia until the darker nature of their society is revealed to them. I don't want to spoil you, just trust me on this one.