OpenVPN vs IKEv2 VPN

short answer: IKev2, because it is newer than openvpn and also Ikev2 vpn must be encrypted by valid SSL, but openvpn can be by both of invalid or/and valid SSL, and usually openvpn providers use invalid SSL. Other reason that Ikev2 has a high speed and rapid connection to the server, and vs openvpn is so slow.

IKEv2 VPN:
VPN IKEV2 is a VPN protocol and it stands for Internet Key Exchange version 2 and it was developed by Microsoft in partnership with Cisco. The IKEv2 is a tunneling protocol and when you pair it with a suite for authentication such as IPSec then it becomes a true and very solid VPN protocol.
The first version of the Internet Key Exchange protocol (IKE) was introduced in 1998 and the IKEv2 came out 7 years later as an improvement on the latter. IKEv2 is regarded as one of the best VPN protocols for mobile users currently available.
When used together with Microsoft’s VPN Connect, the IKEv2 protocol will automatically re-establish your VPN connection after you were momentarily disconnected from the internet.

This means that if you are using the internet and end up in an area where you do not have any reception or the connection simply fails because of various reasons then your VPN connection will be instantly reconnected when you get your internet back without the need for you to intervene in any way.

OpenVPN:
OpenVPN Connect is the official full-featured Windows, Andropid, iPhone/iPad VPN client for the OpenVPN Access Server, Private Tunnel VPN, and OpenVPN Community, developed by OpenVPN Technologies, Inc.

Features:

Fixed VoiceOver issues
* Fixed crash on start issue
* Dropped MD5 support and added error message when using an MD5-signed certificate
* Improved logic of Private Tunnel login and connection processes

OpenVPN offers various internal security features. It has up to 256-bit encryption through OpenSSL library, although some service providers may offer lower rates, effectively providing some of the fastest VPN available to consumers.[19][20] It runs in userspace instead of requiring IP stack (therefore kernel) operation. OpenVPN has the ability to drop root privileges, use mlockall to prevent swapping sensitive data to disk, enter a chroot jail after initialization and apply a SELinux context after initialization.

openvpn, openvpn vs ikev2 vpn

Remember please; between openvpn and ikev2, choice ikev2 to connect the vpn.