Which sci-fi titles (movies, books) do you consider comforting, cozy, something you come back to from time to time? For me, I guess it is The Matrix. Still holds up to this day, gets better with every re-watch, and gives me a sense of peace when I need it.
For me it's definitely a book that often doesn't get much love: Spin by Robert Charles Wilson. I read that book like ten times by now in both English and my mother tongue. Such a defining book for me since I first read it in my youth and it gave me a lot of food for thought regarding what it means to live a meaningful life. It is not really hardcore sci-fi after all but more a kind of coming-of-age novel that happens to take place in a sci-fi setting.