Forex strategies that are traded based on strict mathematical rules with no ambiguous conditions and no important trading decisions to be made by the trader are called mechanical. A good example of a mechanical system is a moving average cross strategy, where MA periods are given and positions are entered and exited exactly at the point of cross. When working with mechanical trading strategy, it is easy to backtest one and determine its profitability. You can also automate such system via MetaTrader expert advisors or any other trading software. The usual drawback of such strategies is their lack of flexibility before the fundamental changes in the market behavior. Mechanical strategies are a good choice for traders knowledgeable in trading automation and backtesting.
Trend-following systems require a particular mindset, because of the long duration—during which time profits can disappear as the market swings—these trades can be more psychologically demanding. When markets are volatile, trends will tend to be more disguised and price swings will be greater. Therefore, a trend-following system is the best trading strategy for Forex markets that are quiet and trending.