i.e do you prefer:
- technically grounded and plausible science elements (e.g The Martian)
or
- stuff so fantastical that it doesn’t even warrant trying to explain it (Dr Who, some Marvel/DC stuff, Star Wars)
Another way to look at this would be Sci-Fi versus Science Fantasy, perhaps.
- Old-School Sci-Fi like HG Wells centers around a core scientific idea and the consequences arising from that,
whereas
- Science Fantasy (more prevalent nowadays) only looks to science - or the impression of some science - to serve the fantasy devices it uses.
So which is better?
It’s never either-or. Sometimes, it is neither.
IMHO, a good Sci-Fi story has a well built world against which a story will play. I loved the ‘Parable’ series by Octavia Butler. The science level is basically the sameas ours (heck, it even plays ‘now’) and is not particularly important to the story itself. However, this series is one of the best dystopian Sci-Fi series I have ever read.