Explore how differences in sector mix, holdings, and fund structure set these two growth ETFs apart for investors seeking diversification.The Vanguard Mega Cap Growth ETF (MGK 1.51%) and Invesco QQQ Trust, Series 1 (QQQ 1.91%) both target large-cap U.S. growth stocks, but QQQ stands out for its deeper liquidity, broader sector reach, and slightly higher yield, while MGK keeps costs lower.MGK tracks the CRSP U.S. Mega Cap Growth Index, focusing on the largest growth names. QQQ, by contrast, tracks the NASDAQ ...