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 strikes me as very sciencey.
However it then surprises the reader by introducing
the alien plague
And therein lies the balance. Real science for where we know (or think we know) the boundaries of science, and completely theoretical fantasy for things we don’t know about (the existence of alien life and what shape it might take)