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.
Anything written by Becky Chambers is like a comfy blanket for your soul. She puts so much humanity and empathy in stories about aliens.