Expense-conscious investors and those seeking sector diversification may find key differences between these two popular tech ETFs.The iShares Semiconductor ETF (SOXX 4.78%) and the Vanguard Information Technology ETF (VGT 2.89%) take different approaches to tech investing -- SOXX focuses solely on semiconductors, while VGT offers broader exposure to technology hardware, software, and services.Both funds provide access to high-growth tech companies. SOXX zeroes in on a concentrated slice of the chip industry ...