Vanguard Health Care ETF (VHT -0.41%) and iShares U.S. Healthcare ETF (IYH -0.40%) provide similar exposure, but the Vanguard fund offers significantly higher diversification at a fraction of the cost. Image source: Getty Images. Both exchange-traded funds target the U.S. healthcare sector, providing broad access to medical companies. This comparison examines how their different management styles and costs could influence an investor's long-term returns, especially considering the massive scale of the Vangu ...