I do not get it. The ES has very deep liquidity and a directional bias. (bull market vs bear market). Starts of bull markets tend to be easy to determine if you look at the right sentiment indicators (i.e. dumb money). In forex, there is no steady long term trend to base your day trading on. However, it seems that since around 2002 (corporate accounting scandals) forex has been marketed as the solution to many investor's problems. There is, however, no reason to abandon index futures.