2001: A Space Oddity beats it by a country mile... Flat screens, talking computers, artificial intelligence and special effects that are still relevant to this day. It could have been made yesterday and you wouldn’t be able to tell that it was actually made in 1967/68. Add the monolith... And it’s a masterpiece of film making that will be remembered for generations.
Bade Runner? Well... It was Blade Runner... An interesting concept with good acting and interesting special effects. A very good movie resembling a western more so, than an actual future... But not ‘the best’ science fiction film ever.
Space Oddity: https://www.youtube.com/watch?v=9_M3uw29U1U
I saw 2001 in the serviceI had never seen a movie like it!