Wireless isolation within SSID vs Wireless VLAN

This is for a small network at home, but I was wondering (talking from a wireless perspective only) what's the difference of creating two wireless VLANs vs enabling Wireless Isolation within SSID? (the goal is to isolate users in the network; they should not see each other, nor share any files, or access any configuration sites on the router).

There's no cable connected to the router, so, all ports have been marked as Excluded in the VLAN configuration (I'm only looking to configure WIFI access to all my users at home).

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