I would definitely recommend using snapcenter to replicate these vms. Snapshots at the volume level wouldn't be application consistent. here is an excerpt from the product documentation.
SnapCenter Plug-in for VMware vSphere
TheSnapCenter Plug-in for VMware vSphereprovides a vSphere web client GUI on vCenter to protect VMware virtual machines (VMs) and datastores, and supports SnapCenter application-specific plug-ins in protecting virtualized databases on primary and secondary storage.