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7Z1 for 3/32" and this style quick link
That link is the reason I'd avoid the 7Z1, which is otherwise an excellent choice. It's fine as a fit-and-forget which you're not going to remove until it's dragging on the ground, but for frequent swaps it sucks.
For @hugo 's purposes, just one dérailleur chain (KMC, Wippermann, or whatevs) and two quick links is the answer, so he can pull out the excess length to run singlespeed and then put it back in for multi-gear use. Every 3/32" singlespeed chainring and sprocket I've checked is thin enough to use 9-speed chain
Chain advice
Cheers.