STI or S&P 500 index?

S&P 500 index. STI is too small to be a traded index as compared to S&P 500.

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S&P 500. The STI has been too stagnant since the global financial crisis. But I would also look at the Russell 2000

S&P500 and the companies there are more diversified with higher earnings growth!

S&P 500. It is diversified into 500 companies, and the exposure of S&P 500 is more global than that of STI ETF