If you are looking to watch online video, access gaming servers, or download content, then this is the VPN protocol for you. IKEv2 will still protect your online privacy and provide you with high levels of security, but this VPN encryption protocol is geared more toward speed.
This is the choice of IPSec experts around the world. With OpenVPN you may experience slower connection speeds, but the trade-off is military-grade encryption.
If you care more about privacy than speed, OpenVPN is the strongest VPN encryption protocol.