Renko and Heiken Ashi help filter out small price movements. However, they use different methods. Renko uses bricks to show only meaningful price changes. Heiken Ashi employs unique candlesticks to smooth out price data. Therefore, Renko is good for seeing trends as candles will merge with the previous ones when the price does not move. Heiken Ashi has the advantage when you need to understand whether you should enter or close a position.