Key differences between VRRP and active gateway
Configuration:
Active gateway is a single-line configuration of virtual IP/MAC configuration on an interface VLAN.
VRRP requires VRIDs configuration per VLAN, roles per VRID, VRRP advertisement timer configurations, for example.
Data plane:
VRRP is an active-standy data plane and only the VRRP primary device is forwarding traffic.
With active gateway, both devices are forwarding traffic.