I prefer TV series as a medium; I have trouble sitting through a whole movie, and I think the way series have 'chapters' like a book is really helpful for a lot of stories. There's also just a lot more detail you can put in a long show.

All that being said, I'm so sick of series that don't go anywhere, or get cancelled prematurely. Other than miniseries like Queen's Gambit it seems like so many just sort of wander off into mediocrity after some seasons. Game of Thrones, Stranger Things, Outer Range (soon)... Now I wait for series to end before picking them up, at least in the case of plot-heavy shows like those. There's less of an issue for comedies and other types of shows where the story isn't the main draw, so that's the sort of TV I end up watching the most.