Tactical trading is based on an identification of the strongest and weakest markets. Looking at a whole load of different markets globally, it is relative easy to make this distinction. Once this has been accomplished, liquidity can concentrate on commodity and ForEx markets. But nonetheless, one needs to realize that this does not give a guarantee of whether or not the commodity trade will actually work.
One of the biggest advantages of tactical trading however, is that finding new trends becomes way easier. Having said that, even if you do successfully manage to identify strong and weak markets, you will probably incur various (minor) commodity trading losses as it is next to impossible to prevent them. Your main aim is to detect major market flux in the stock market to your best advantage.