For a straight plot-to-screen adaptation, I'd think movies (or, at most, miniseries) are the way to go - unless I someday write a multivolume epic. Yes, there's likely to be some condensing and/or adaptation, but it tells the story without extra embelishments or the need to make everything "episodic" in nature.
For exploring the worlds around and beyond the story, a TV show might work... assuming anyone deems any of my story worlds worth hanging around in. That way, the arcs aren't tied to the book so closely, allowing it to take on a life of its own. (TV being a group effort, I can only imagine what a team of writers might come up with that I, by myself, fail to see.)
But, really, I need to actually write the things first, then convince other people they're worth reading.