Expense-conscious investors weighing emerging markets exposure will find key differences in cost, risk, and portfolio breadth here.iShares MSCI Emerging Markets ETF (EEM +0.70%) is costlier and more volatile, while Vanguard FTSE Emerging Markets ETF (VWO +0.60%) offers broader holdings, a much lower fee, and a slightly higher yield — but lags EEM in recent total return.Both EEM and VWO target large- and mid-cap stocks from emerging markets, with heavy exposure to Asia and big names like Taiwan Semiconductor ...