IKEv2 sets the foundation for a secure VPN connection by establishing an authenticated and encrypted connection. It was developed by Microsoft and Cisco to be fast, stable, and secure. It succeeds on all of these fronts, but where it really shines is its stability. As part of the IPSec internet security toolbox, IKEv2 uses other IPSec tools to provide comprehensive VPN coverage.
OpenVPN is a very popular and highly secure protocol used by many VPN providers. It runs on either the TCP or UDP internet protocol. The former will guarantee that your data will be delivered in full and in the right order while the latter will focus on faster speeds.
This post explains VPN protocols and how to choose the right one for the best. VPN Protocols: PPTP VS SSTP VS L2TP/IPSec VS IPSec/IKEv2 VS OpenVPN VS SoftEther VS WireGuard.