The platform is just as important as everything else, take a look at Anchor.
Kunal Bhatia- Co-founder & Design Lead @SlidesUp
Anchor does a nice job with allowing you to create podcasts directly from your phone with some great engagement features. They also allow you to convert your existing podcasts from SoundCloud, RSS, etc., to make the switch easier (see https://anchor.fm/switch). You can even publish Anchor podcasts outside the app to Apple and Google.
Leigh Cooper- I make videos on the internet!
Agree with Kunal! Anchor's mobile tools are great. The only downside is that (as of yet) you can only add clips from an external file from the desktop version, and all podcasts are cut into smaller Snapchat story-like chunks. I'd recommend it more for shorter podcasts than longform conversation podcasts.