Determining the "best" trend indicator for stocks can be subjective and depends on various factors such as trading style, timeframe, and market conditions. However, one widely used trend indicator for stocks is the Moving Average (MA).

Moving averages smooth out price data over a specified period, providing a clear visual representation of the underlying trend. Simple Moving Averages (SMA) and Exponential Moving Averages (EMA) are two common types used by traders. SMAs give equal weight to each data point within the chosen period, while EMAs assign more weight to recent prices, making them more responsive to current market conditions.

Another popular trend indicator is the Moving Average Convergence Divergence (MACD), which combines two EMAs to identify changes in momentum and potential trend reversals. The MACD line represents the difference between the short-term and long-term EMAs, while the signal line is a smooth average of the MACD line. Traders look for crossovers between these lines to signal potential buy or sell opportunities.

Additionally, the Average Directional Index (ADX) measures the strength of a trend rather than its direction. Traders use the ADX to confirm the presence of a strong trend before entering a trade.

Ultimately, the "best" trend indicator for stocks depends on a trader's preferences, risk tolerance, and overall trading strategy. It's essential to experiment with different indicators and combinations to find what works best for individual trading goals and preferences.