I've been a paying user of Pocket Casts for a while. I like that it also has a web version as well as a mobile app, so everything is always sync'd.
Podcast Addict has some niche features I really like, I like being able to have a different automatic playback speed per-podcast, as I tailor it to the talking speed of the specific podcasters. The UI can be a bit cluttered, but in a power-user "I can make this work exactly how I want for each podcast" way.