Why 1/8" chains?

Like someone mentioned, it's not stronger, nor lighter..

The fact is that the sideways flex in a 1/8" chain is far less then any 3/32 chain built for shifting.
With that, you can run 1/8" chains on 3/32 cogs with no real disadvantages.

I used to muck with 3/32 shifting cogs, and 3/32 chains. With a lot of torque the chain would force itself off. When I switched to 1/8" the chian never came off anymore. This is assuming your chain line is STRAIGHT.

You mentioned lots of sound when riding, well a 1/8" chain is actually a bit looser on the cogs and chainring so it'll allow some "breathing space". That would help with noise.

Okay hope that helps. You can always run 3/32 on a fixie.. it's really just preference. KMC BMX chains are what I use.