Note :- Both VPC and VSS are used basically to support multi-chassis ether-channel that means we can create a port-channel whose one end is device A,however, another end is physically connected to 2 different physical switches which logically appears to be one switch.

The Differentiation between both the feature set is tabled below –

S No                               VPC                                    VSS
1 Feature specific to Nexus Feature specific to catalyst 6500,4500 Series
2 Separate control plane for both switches. 2 Switches merge to form 1 logical Switch with a single control plane.
3 Separate IP for each switch management and configuration. Single IP for management and configuration of 1 Logical Unit (2 Physical Chassis)
4 HSRP is required. First Hop Redundancy Protocol like HSRP not required.
5 Separate instance of stp,fhrp,igp,bgp etc will be required on each physical Switch of VPC. Same instance of stp,fhrp,igp,bgp etc will be used on each physical Switch of VSS.
6 Both the switches are active and work individually.Only from VPC perspective are they elected primary and secondary. Switches are always primary and secondary from all aspects.
7 Supports L2 Port Channels Supports L3 Port Channels
8 Supports LACP Supports PAGP and LACP
9 Control messages are carried by CFS over Peer Link and a Peer keepalive link is used to check heartbeats and detect dual-active condition Control messages and Data frames flow between active and standby via VSL
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