"The Lathe of Heaven" from a novel of the same name by Ursula K. LeGuin.
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there are two types of si-fi movie I feel after seeing in these years , one is attracted by it's fact and concept and another by it's story telling way and graphic situation , in first case i always prefer Arrival as in first position and in second case my all time fave is Predator (1987) this is made b4 my birth and I have seen that after 20 years of my birth and get addicted to it

The first one that really blew me away was 2001: A Space Odyssey, and although I think it's aged well, it is very much of its time. The most recent one which I watch fairly often is Interstellar because if it's excellent mix of great plot line, good theoretical science, excellent characterisation and the wonderful organ based score.

There are many others I could list, but you've asked just for my favourite.

Edited to get the title right 🤦‍♀

Sunshine is one of those films for me that I think is a masterclass in directing. There is zero fat on that film. The dialogue is perfectly relevant, there's excellent foreshadowing, the tension and anticipation is precise, characters are given so much nuance and personality through body language and tone. I truly love that film.

12 Monkeys
Solaris
2001: A Space Odyssey

I’ve also enjoyed sci-fi anime films like Akira and Ghost in the Shell.

Alien

The Matrix

Cable

Prob the one with the Father Knows Best boy and Michael Rennie. It's short and real 1950s-like.

Arrival

Too many to list 👍🙂

Fifth Element

Older: The Day the Earth Stood Still, The Time Machine, Soylent Green, Planet of the Apes, Jurassic Park, Predator, Independence Day

Newer: Lucy, The Tomorrow War, Serenity, 2012, A Quiet Place... to name some

Lately it's Earth vs. The Flying Saucers. But the one I have seen the most is Plan 9 from Outer Space.

The Matrix trilogy.

Terminator was good too.

Check for messages.

The Fly. Both versions and the book.

Bit of a toss-up between Forbidden Planet and Silent Running.

Blade Runner or Galaxy Quest depending on mood.

12 Monkeys
Blade Runner

2001 A Space Odyssey

Blade Runner

Debbie Does Dallas