Vocal is a desktop podcast client with feed subscriptions, downloads, and saved episode positions. If you are comparing alternatives, the hardest part is often moving a listening library without losing the queues you actually use.
Export your subscriptions from Vocal and import the file into one candidate. Count feeds before and after, then inspect a private or unusual feed manually. Play part of an episode, resume it after restarting, and test an offline download. Check whether the candidate preserves playback position, played status, custom skip intervals, and any ordering you rely on—do not assume that a subscription export includes all of them.
The Vocal project describes its import/export and playback features. Keep the original installation and its library backup until the new client has completed at least one normal listening week.