VTP version 3: where to place clients (vs secondary servers)?

Once there is a "Primary Server" in a domain instance, does it matter if the remaining devices are "Secondary Servers" or "Clients"?

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Please correct or add to my thinking on this.

Clients

• Ver3 clients will maintain their vlan database in temporary memory (dram).
• on a reboot, Ver3 clients will request an update
• Clients can forward updates also.

Servers

• Only one Primary Server per domain instance. Is only device that can modify vlans.
• on reload, a Primary Server will come back as a Secondary Server.
• Secondary Servers store their VTP info in permanent storage (nvram).

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The question is, in a hub and spoke of switches (several daisy chained), where to put Secondary Servers and Clients? Just make them all servers (very small vlan database) or mostly client with some secondary servers as sort of backups?

VTP Version 3 https://www.cisco.com/c/en/us/products/collateral/switches/catalyst-6500-series-switches/solution_guide_c78_508010.html

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