How does option isolate work

Considering only the Wireless aspect of a network, is there any security advantage of creating a separate SSID for guest, rather than simply setting option isolate to my lan?

I am not aware of any. Given that I am ok using the same dns resolver for guest and lan (I don't see much value in differentiating), I am tempted to simply use option isolate, and share my lan's wifi key with my guest. Does that reduce the security?

2 posts were merged into an existing topic: Isolate clients on wifi