Explore how differences in cost, holdings, and sector focus set these two small-cap growth ETFs apart for portfolio builders.The State Street SPDR S&P 600 Small Cap Growth ETF (SLYG +0.74%) and the Vanguard Small-Cap Growth ETF (VBK +1.06%) both target U.S. small-cap growth stocks, but VBK charges a lower fee, is far larger by assets under management, and shows a stronger recent performance record alongside higher volatility.Both SLYG and VBK are designed to capture the upside of U.S. small-cap growth compa ...