The switching thing is really weird, for me it is always saved across devices and I can just play from where I was on the other device. But maybe that is a newer feature that wasn’t yet there when you tried it.

Overall, my impression was that Plex is a lot more polished

That I can understand, but with plex trying to be a streaming provider themselves, it makes it very confusing for not so tech-savvy people

I also have a plex lifetime pass beacuse it was really the only option like 10 years ago and it was pretty solid. I run plex and jellyfin in parallel now and some of my friends use jellyfin, others plex. I myself almost only use jellyfin at the moment and it works pretty well for me