@ewdocparris My favorite would be anything set on another planet or in the future that is not dystopian. I just want to remain hopeful that someday, somewhere, things will be better, and that we aren't all going to revert to a near stone age civilization (but somehow, amazingly, with plently of gasoline to run internal combustion engines - I mean, give me a break, civilization is completely broken down and yet the refinerys are still working?).
My least favorite is anything related to horror. I am not a horror fan at all, so if your idea of sci-fi is people getting killed off in various gruesome ways then we have very different ideas of what constitutes good science fiction.
My favorite #SciFi of all time was the old Stargate (sometimes called SG-1) TV series. I can't exactly say why except that it had a lot of the elements I liked and few I didn't. It was a shame that only the last few seasons were filmed in high definition. I sometimes wish they'd reboot that franchise, although I suspect if they did they would totally screw it up and come up with something not nearly as imaginative and entertaining as the original.