At this point, I seriously want eren to win, well unless Armin gives a better way for both Paradis and marley to both survive. Marley had centuries to give up their hatred towards Paradis and eldians but they didn't. They killed innocent eldians and used them as sacrifices. They wanted Paradis for its resources and wanted to kill all the eldians in the island who were living peacefully. So, even if Armin and co manage to kill or stop eren, marley will probably leave paradis alone for a few decades but they will definitely nuke paradis to kill them all and considering the titans are starting to lose their effectiveness in war, the eldians will be killed off. So, it's basically a war for survival, which eren understood and Armin doesn't cause suddenly, he's a shounen protagonist who is a goody goody two shoes who thinks the world is rainbows and sunshine and candy.
I thought Armin was really smart, but if he wants to stop eren just because, i will really hate this manga.
Oh, and Gabi needs to die. If she lives, imma gonna be pissed. Even if eren dies, if he is historias baby's father, it would be okay cause that way eren gets what he wants, a family