The best ETF to buy will be based on which company fund has the lowest expense ratio. The best ETF to buy will be based on the Assets Under Management (AUM) amount; an ETF with more AUM is better to park your money in. There is more we can see about the credibility of the fund manager and company. ETFs will be an option for less expense than a mutual fund if you are in the market. If the market grows, you grow; if the market falls, you also fall. There is no headache over which stock to buy and when to buy. Which stock to buy can be formulated somehow, but timing the market is, I feel, just luck because there are many factors that can change the stock price in the opposite direction from what we are thinking. Just to summarise, which ETF is best? 1. Based on risk appetite, choose any one of the Nifty 50, Next Nifty 50, Sensex-based, sector-based, etc. 2. Low expense ratio 3. High AUM 4. Good fund manager and company Please comment with any thoughts or questions. Thanks...