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@DFP
Firstly if you have a rear sprocket already, that pretty much settles what chain you should run. But..
I use 3/32 for my bike running 52-19, with road chainring. For that much chain it feels right to have a thinner chain. Flus its a flexy old big raleigh so it all suits.
On my newer stiffer small bike with 39-15 gearing, 1/8 chain made a lot more sense, especially as a bmx chain works out the perfect size. That bike feels well smooth, silent responsive drivetrain.
So its kind of evolved into a rule now for me, if a standard bmx chain wont wrap the gearing then its a 3/32. It also makes more sense for larger road rings as they are relativeley weak and flexy compared to the chain.