Yet it's not all about durability, but of strength. A shock in the drivetrain (a kerb jumped, a hiccup in pedaling, a pothole hit during skid braking..etc) can snap a chain, in result of serious damage (the wheel still spinning grabs the chain around the frame and can and will bend the seatstays/chainstays, also that chain could have been the only brake on the bike an that is more problematic).

So for a fixed gear chain, strongest is best in my opinion (I do care of my life, even if riding FG in the city it's not so "healthy")

I'd love to test a batch of chains at a traction machine to determine the strength, but I'm not getting any sponsors on this area of material science/assembly organs, so otherwise than fun at my own expense I cannot run studies on bicycle chains.