The answer to you question might be a little situation dependent.

The host management network is the only medium you can connect to host and manage it. Be it vCenter, vSphere client or SSH.

If the VM and management network are using different uplinks and you can afford not to manage host unless VM are running and we fix the network issues on management connectivity then you can choose not to have redundancy( Own risk and should only be done in lab setup and not in production).

Any good infrastructure design should always have redundancy for management. You can configure multiple uplinks to management network on vDS and vSS both.

Advantages of doing it on vDS is a command template applied all host connected to that vDS compared to individually doing it on host on vSS.

Regards

Sharath BN