Question: is ikev2 better than l2tp?
Answer: IKEv2 is not as common as L2TP/IPSec as it is supported on many fewer platforms (although this situation is changing fast). It is, however, considered at least as good as, if not superior to, L2TP/IPsec in terms of security, performance (speed), stability and the ability to establish (and re-establish) a connection.