Which VPN does VPN load balancing on the ASA support?

DVTI (Dynamic VTI) is a Cisco IOS router feature used in hub-and-spoke deployments and is not an ASA-supported VPN type for load balancing.

Cisco ASA VPN load balancing supports VTI (Virtual Tunnel Interface) based VPNs. VTI provides a routable interface for IPsec traffic, which integrates with the ASA load balancing cluster to distribute VPN sessions across cluster members. This is the only VPN tunnel type the ASA load balancing feature is designed to work with.

DMVPN is an IOS router-based solution that uses mGRE and NHRP and is not a VPN technology native to or load-balanced by the ASA.

GRE alone is a tunneling protocol, not a standalone VPN type supported by ASA VPN load balancing.