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@colm
Dont think Ive ever seen a definitive reason to choose 1 over the other besides 1/8" having more surface contact area between chain and cogs so less deformation on the chainring teeth as the force is spread out more.
The Japanese keirin riders only ever use 1/8" but there are 3/32" dura ace chainrings available and Id have to double check but they may have njs stamps on them.
both chain types have the same side plate thickness so share same tensile strength, not sure how much lighter 3/32" is,
ill weigh equal lenghts of new kmc 510hx and 610hx some time for comparisson. The lighter weight would prob offer negligble acceleration advantage, the chainrings are same thickness up until the support ridges at the edges were the teeth begin.
Shimano had their Dura Ace 10cm pitch but overall it wasnt much of a weight saving.
in conclusion 3/32" looks funny on a fixed/track bike, it looks weak and skinny. 1/8" should always be used with the largest chainring possible