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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
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Its not the link from the 7z1, they are difficult to open again.
I think this one is the good one:
(sold out) https://www.bike24.com/1.php?content=8;product=184236;menu=1000,2,83;page=19
I bought a whole bag of them from somewhere.
Wippermann conneX 7Z1 for 3/32"
and this style quick link (because you can open them by hand):
Good for single speed maybe not gears : the pins protrude a bit to one side