I'd say the commodity that you can use spastically small lots.
In other words, I think it doesn't matter which commodity you deal in, the small term movements are outrageous. How it relates to forex is that perfect trades in AUD or EUR get completely botched frequently because of a move in gold, for example.
While AUD and EUR are considered risk assets in the sense that they're high yield, gold doesn't yield anything other than price appreciation.
I say that the short term movements are outrageous because they laugh in the face of technical indicators in my experience.