Well I already have jellyfin running in a container, just have to figure out how to get mum's TV to work with it I guess
log in on a local IP and not the network name and it's working again. but I'll be moving to jellyfin from now
How about... Neither.
I don't think OP doesn't know, but I feel like its been said multiple times here, so maybe op either missed it or has a use case where he still wants to use Plex.
I have a Jellyfin server and I don't need to expose it to the internet. Look at all the posts and comments here about setting up a reverse proxy and to securely expose your server to the internet. But you can also just keep your server locked behind your firewall and only access your network using a self hosted VPN.