I'd love to switch to AntennaPod, but I haven't figured out how to sync across platforms. I've heard of Gpodder, but I guess I'd need to host my own instance? Gpodder.net just gives me errors when I try to sign up, and from a quick web search it seems like this has been normal for quite a while now.
I wish I could just save all my metadata to a standard file format, sync those files any way I want, and have all my clients use that. But I don't think that's possible with any existing podcast clients. :/