Emac VLAN pros

Hello

We have 3 vdoms DMZ, a, b and we need to interlink them where the traffic passes from DMZ to a or b vdom, a<->b is not required as these are separate business.

One option is to create two vdom links with dedicated small vlans for DMZ<->a and DMZ<->b

Second option is vlink0 to be on DMZ and vlink 1 to have sub-interface a and b using emac vlan

I want to know if there are any pros and cons to either of this solution.