IVPN goes further than the other leading candidates we considered by being transparent about who runs the service and is responsible for your privacy. The company lists its core team on its website, and its small team has an online presence on a variety of platforms. In contrast, only one employee at ExpressVPN has a public face: VP of marketing Harold Li gave us detailed answers to questions about policies and internal security, but couldn’t tell us much about who else worked there. (We discuss ExpressVPN in more detail in the Competition section—that company was almost our top pick but for this issue.)
My recommendation, and the protocol I most often choose to use, is OpenVPN. OpenVPN is a non-proprietary, open-source implementation of a VPN communication layer protocol. It's well-understood, well-regarded, generally quite secure, and robust. In addition, it has the benefit of being able to communicate over port 443, which is the standard port for https communication, which means almost all firewalls will allow OpenVPN traffic -- and most won't even be able to detect that a VPN is being used.

Early data networks allowed VPN-style connections to remote sites through dial-up modem or through leased line connections utilizing Frame Relay and Asynchronous Transfer Mode (ATM) virtual circuits, provided through networks owned and operated by telecommunication carriers. These networks are not considered true VPNs because they passively secure the data being transmitted by the creation of logical data streams.[3] They have been replaced by VPNs based on IP and IP/Multi-protocol Label Switching (MPLS) Networks, due to significant cost-reductions and increased bandwidth[4] provided by new technologies such as digital subscriber line (DSL)[5] and fiber-optic networks.

They even offer the most generous simultaneous connection count, with six simultaneous connections through their network, where everyone else offers five or fewer. NordVPN's network isn't as large as some of their competitors, so if you're trying to obfuscate your tracks, you might want a company with more servers. Otherwise, this company is clearly providing a winning offering.