For a time and I have no idea if this is still true Plex had a serious advantage in the sheer range of client platforms it supported (iOS, Android, smart TVs, Roku, etc.)
They support (or did previously support) more platforms, but Jellyfind is what runs at a reasonable speed on my phone, so that's what'll get used
I’ve heard from a lot of people who accidentally upgraded to the latest version of Plex on their iPads that it’s a shadow of its former self: tons of features are missing, SRT are unreliable, picture-in-picture flakes out, etc etc.
No native app for LG TV, but I have an Android TV box anyway.
I can't say how well it works on Apple devices and other TV brands.