Gundam: Iron Blooded Orphans, saw it on netflix and was hooked after the first ep. im a huge fan of Cowboy Bebop, and even though its very different it reminded me of that a lot
I've never seen a Gundam series before but apparently its nothing like the main ones, and i found it real easy to pick up. its 50 episodes in 2 seasons, definitely worth checking out
i enjoy Attack on Titan as well, i read the manga though, i honestly feel like maybe the ending could be saved if its paced right, but im hoping by the time they get to it the writers could be allowed to change it entirely lol