I would not recommend the use of trend lines except to track long-term trends over a period of months. Shorter-term trend lines can be very misleading. Often, by the time the shorter-term trend line (weeks or less) is established, it becomes obvious, and fails shortly thereafter. Moving averages are a better guide.
For trading Growth Stocks or Options in stocks, I utilize 8, 21, 34 day exponential moving averages to execute buying n selling decision. 50, 100, 200 day simple moving averages r best used to evaluate the momentum on longer term time frame for trailing stops