Just Sharing my views.
Seniors can comment/correct, provide better methods.
With Relative Strength ranking you can pick the best stocks in the best sector.
Having said that , it is a difficult process.
Difficult with Nifty , since the Index is skewed heavily towards Banks, IT, Power and does not represent the true picture.
Attached is the image for sectoral performance of stocks in NSE for last 3 months.
A simple idea is to select a couple of strong stocks from a strong sector and review either weekly/monthly/quarterly for outperformance/underperformance.
Seasonality helps you to understand at what time in a year and at what phase in a business cycle a particular sector will underperform or outperform.
Either you can review/analyse/churn your own portfolio or give it to professionals.
Latest 3 months Sectoral Returns
Latest 3 months Sectoral Returns
Constituents Stocks of Highest performing Sector