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I can't see any advantage in having the same chain on all your bikes.
A standard roller (bushed) chain would be preferable to a bushingless chain though.
However there aren't many bushed chains made nowadays. There's the Connex 7R8 (3/32", 1R8 is 1/8") and KMC B1 (1/8"). I'm sure if you roused Tstr from hibernation he could tell you others.
Having said that, apparently you're still living so I suppose it's fair to say that while one is technically better than the other, it's not critical. Personally, I'd choose a bushed chain, over matching the width to the sprockets (the 7R8 is "nice but pricey", the B1 is very reasonable).
TLDR: whatevs.
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I had a Genesis Day One, running 44/16 fixed. Changed everything to 1 1/8 as parts were much cheaper and more easily available. Not as quiet but much stronger. This was a few years ago now.
Would recommend 1 1/8. I bought quite a few of the KMC chains then switched to the Izumi track chain. The KMC ones stretched out much quicker.
Time to change the chain on my Day One.
Currently fitted with a kmc (I think) 8 speed chain but every other bike I have runs a kmc 510 (1/8" singlespeed chain).
Do I switch to a 510 on the Day One so it's the same as all other bikes or stick to an 8 speed chain.
Chainring and sprocket on the Day One are obv 3/32" so I know some of you will say a 3/32" chain will run better but most of my other bikes have a 3/32" cog at at least one end and I don't have any complaints of how they run.
TLDR: 1/8" or 3/32" chain for singlespeed?