I usually fall back on "SF" for all the varieties (in any medium) of speculative fiction that show some care for the art and craft involved in creating good fiction.

"Scifi" (pronounced Skiffy) I reserve for the bad and schlocky stuff, some of which I still love but for completely different reasons.

"Sci-Fi" sounds like the gadget Captain Kirk would use to play recordings of his favorite makeout music while scoring with this week's alien babe.