GCC vs. DBA.
If I'm to use a commodities basket as currency what I need in trading is liquidity, which unfortunately GCC doesn't provide, but DBA does.
However, GCC gives me a better timing signal than DBA, so what to do? Go with the liquidity or go with the signal.
Answer:
I'm going with both. I'll watch GCC, but invest in DBA. Over the long run they are close to a 1:1 match.
So I'll speak in GCC terms, but put my money in DBA.