Shingeki no Kyojin, Fate/stay night: Unlimited Blade Works 2nd Season Recommendations
These anime can be similar because of the goal of the main characters. Let me explain. Both Emiya (fate) and Eren (Shingeki) developped some kind of power to overcome an extremely powerful opponent. Both of them have to fight for their lives and for the lives of those they care. In the end, both of them make a huge difference in their respective way. I highly recommend both of these anime as mush as the entire Fate series although fate zero can take some time to give us some good figthing scenes.