I principally use VPN.AC, they are rock solid. I also have NordVPN, works well and Surfshark which is also good. I will be sticking with VPN.AC as I don’t need to go chasing servers to access US content Netflix from Australia.
All three work quite well on my Ubuntu 20.04 LTS machine, my one Windows 10 (weather station and solar system monitoring) and my other media/TV PC running Ubuntu 20.04 LTS.
However, my preference for use and hassle free operations is VPN.AC.