Thin vs Thick Lazy Zeroed + SAN thin provisioning

Is there any benefit to using Thick Lazy Zeroed and then using Thin Provisioning at the FC LUN level vs just using Vmware Thin provisioning?  I guess I could use Thin for both VM and LUN, too.

Does Thick lazy Zeroed cause less lock/delay when filling unused space compared to Thin?

I don't think we see any savings using Thick Eager Zero with San Thin provisioning on our Netapp.