Institute I sorta like, they seem to be an ends justifies the means group, which I can somewhat get behind. For me BoS is the way to go though. They want to rebuild and they use an iron fist to do it. In a post apocalyptic landscape this seems like a necessary evil, and is a lot more transparent than what the institute wants to do. The railroad though is the group that scares me the most and are on the path to humanities destruction. By freeing and protecting synths they are essentially creating a new race of life we have to live with. A genetically engineered much more intelligent and powerful life. At some point I would fear synths making a power grab and start to enslave humans. Plus they want to give you a synth baby and that creeps me out.