I personally use AirVPN. I detest the software client. It’s open source at least, but it feels like it was made for Windows XP and just ported forward.

That said, it supports Wireguard, so making my rpi log into the VPN anytime it goes offline is simple. Same for my laptop and phone.

Decent rates, good ways of dealing with per-device things, easy to lend the account to people who need a VPN, and often has sales.