What is the most accurate way to Backtest using MT4 (BUILD 202)??

 
What is the most accurate way to Backtest using MT4 (BUILD 202)??

Every Tick, Control Points, or Open Prices Only?? Also how accurate is it? Does it depend on the broker?? I use Interbank FX.
 
It depends on used strategy. If there is no necessity to trace everyone change of a price, and thus to spend testing as much as possible quickly - use model Open Price only. Comparison of types of modelling is resulted in the article Strategy Tester: Modes of Modeling during Testing
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