VSIC

I am designing AV solution for an enterprise having 4000 endpoints including 2000 VDIs.

Among two Shared Insight Cache, which one Symantec recommend for DVIs 

From all my readings, i understand that the Vshield Enabled Shared Insight Cache works with Vshiled endoint, in the Hypervisor level.

Is there any disadvantges of implementing VSIC except having one each Virtual applience per host.

Am i missing anything if I implement Network shre insight cache instead of VSIC for VDIs?

Please share some enterprise experience and recommendation..

Thanks and regards,