In what why is the router better for Vodafone? You can always buy a decent router at a good price, don't change networks because of their router. I liked Plusnet router when I was with them as it was basic, with no useless [censored] in the firmware that is not needed, unlike BT router.
As for the service itself, I doubt there will be any difference, FTTP is more or less the same from any of the Openreach based services.
While it was FTTC, I went with Plusnet as a stop gap and ended up staying for 9 years almost, had one major issue and that was not a plusnet problem, but an Openreach problem. I was happy with them, going to another provider would have not made a difference.
I would say stick with plusnet unless Vodafone offers you something you need.
Adrian
Desktop machines Mac mini pro with macOS Sequoia, also pc Ryzen powered with windows something or other.
Zooming with Zzoomm FTTP,