I've only ever listened to fiction podcasts so
The Magnus Archives - The newly promoted head archivist of the Magnus Institute is organizing the mess of files files his predecessor left behind, dictating them for the records. The Institute is devoted to collecting tales from people who have seemingly had contact with the supernatural. Starts out being very episodic, each one being a little "creepypasta" kind of thing but gets more serialized as it goes along. This was the first horror podcast I listened to and that kind fucked me over because this is apparently the best one lol.
I Am In Eskew - Eskew is a inescapable city where the rain never stops and horrors are commonplace. David decides to start making audio records of his life in hopes of reaching the outside world. Somewhat serialized but still mostly episodic. This one's hardcore horror, but it's also very dryly presented.
SAYER - This one sadly seems like it'll never be finished (I checked twitter and the writer/main actor seems to have thrown a recent hissy fit over people asking him about it), but it's a good ride. In the near-future, an asteroid hits Earth. In the devastation that follows, a corporation called rolith Dynamics launches the asteroid back into space as an artificial second moon and sets up a research station on it. SAYER is the AI that runs the day-to-day activities and each episode is him speaking to "you" through a neural implant. Somewhat horror, somewhat black comedy.
Wolf 359 - This one's not horror at all. A three-man + one AI crew on the space station Hephaestus, orbiting the distant star Wolf 359. Starts primarily as an episodic comedy and (a running theme here), gets more dramatic and serialized as it goes along.
Welcome to Nightvale - The ur example of fictionalized podcasts. Welcome to Nightvale is the radio program of the main character, Cecil Palmer. In Nightvale, the supernatural and paranormal are considered boring and mundane. No one questions that Old Woman Josie spoke to angels, but they still refuse to say that angels exist because the Sheriff's Secret Police have outlawed the belief in angels. That kind of thing. People call it a horror podcast and it sometimes goes in that direction, but it's much more black comedy than anything else.
I haven't listened to this one myself, but Not Another D&D Podcast (or NADDPod) is considered one of the best. I've seen a few of its players in Dimension 20 and they were great, so you might like this one if you liked The Adventure Zone.
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So? I deeded to some gay porn. It doesn't mean anything. - Patty_Fleur