I know that this is not a proper review, but I just gave you the names of the only VPNs I used and trust. I prefer njalla because they don't even require any special app and just give you the configuration files if you want to use wireguard or OpenVPN.
Right, but there are also all those other providers who wants you to use their own app. "Being able to connect only with a configuration file" is a necessary but not sufficient condition on my checklist.