Expense-conscious investors face a key choice between broader coverage and focused strategy in the consumer staples sector.The Vanguard Consumer Staples ETF (VDC +0.13%) stands out for its much lower cost, broader diversification, and stronger risk-adjusted returns compared to the Invesco S&P 500 Equal Weight Consumer Staples ETF (RSPS +0.15%), though both funds focus on the U.S. consumer staples sector and offer the same yield.Both VDC and RSPS target U.S. consumer staples stocks, but they take different a ...