OROCF is an Australian Mining company, so its price movement should be affected by ORE as well as that companies fundamentals. So by buying it you are not only bullish on ORE you are bullish on that company.
If you buy ORE on the Australian market it should track the price of ORE more closely. Whether you buy an ETF or Futures contract it should track the price of ORE better then OROCF, it will also be affected less, if at all, by what happens in Orocobre, (OROCF)
