There is an evolution underway in the exchange-traded funds (ETFs) space that allows financial advisors to construct better portfolios for their clients.ETFs originally were designed to replicate the returns of well-known, market capitalization-weighted indices such as the S&P 500 composite index. Today, the index methodologies that underlie certain ETF portfolios have advanced in three significant ways to create the potential for superior risk-adjusted returns or even market-beating performance.