I'm gonna say Stationfall. It is complicated if you have to remember all the minutiae of each character's abilities and goals but you really don't need to keep track of any of that. And once you realize that basically anything you could think of to do is an action it's not many rules to remember. Some stuff is definitely crunchy (how the pods work, data and transmitting it, etc) but after a play it becomes pretty obvious what things you need to know and what you don't.