Join Date: May 2004
Location: Orange County, California
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Can't tell you what's "better", you have to decide for yourself.
I can tell you the pros and cons of each. Actually, that would be the differences, you decide if they're pros or cons.
The main reason someone would go full 3/32 drivetrain is weight savings. I say fooey. It isn't that much and weight doesn't make that much difference on the track.
For the chain, some say 3/32 will snap, some say 1/8 is too heavy. I say go with 1/8 because you have more selection of chains to choose from. Real 3/32 track chains are harder to find. That leads some people to use a road chain, not a good idea because they are designed to flex laterally.
Also, with a 1/8 chain, you can use 1/8 or 3/32 rings and cogs. This is very helpful if you need to borrow one from someone.
For cogs, I also go 1/8. It fits the chain. If you have 3/32 cogs, use them. When you buy new ones get 1/8 to go with the chain. They cost the same and like 1/8 chains, their are more to choose from.
Now some people will say "NEVER mix 3/32 cogs and/or rings with 1/8 chain! It makes too much noise." Well if your chain line is good, it will be just fine.
For rings, it depends on your cranks. The standard for track is a crank with a BCD of 144mm. A lot of the entry level bikes come with a 130 BCD crank. Rings can be pretty expensive. If you have 130 BCD, you can get road or BMX rings in 3/32 for much less. This is what I had to do when my daughter started riding track. 1/8 chain, 1/8 cogs and 3/32 rings. The bike ran smooth and quiet. No problems.
So I'd go 1/8 chain so you can run whatever cogs and rings you have, get or borrow.
That's my .03 Hope it helps.