Which Gold ETF Is the Better Buy: iShares' IAU or State Street's GLD?

iShares Gold Trust (IAU) vs SPDR Gold Shares (GLD): both track physical gold in lockstep, but IAU’s expense ratio is lower at 0.25% versus GLD’s 0.40%. Over the trailing year, total returns are nearly identical (IAU 29.2% vs GLD 29.0%), with matching 5-year max drawdown of -26.4%. The article frames IAU as the better long-term buy-and-hold option primarily due to compounding cost savings, while GLD is positioned as the higher-liquidity choice for institutional traders.

Analysis

This is less a gold call than a wrapper-selection call, and that matters because in a near-perfect tracking product, the only durable edge is fee drag and distribution. Over a 1-3 year horizon, IAU should keep winning marginal retirement-plan and model-portfolio inflows because allocators are increasingly fee-sensitive in low-beta hedges where basis risk is tiny. That is a slow bleed for GLD's AUM growth, but not an immediate liquidity crisis because GLD still owns the institutional options and intraday-hedging franchise.

The second-order dynamic is that GLD's moat is more about market structure than economics: if vol spikes or macro stress returns, traders will pay up for depth, tighter hedging, and options open interest, which can overwhelm a 15 bps fee gap. In other words, GLD is the better tactical instrument when speed and size matter; IAU is the better strategic holding when time horizon is measured in quarters to years. The market is likely underestimating how sticky that split is: advisers default to cheaper exposure, but macro desks still default to the deepest liquidity pool.

Contrarian view: the consensus overstates how much fee differences alone can force a rapid migration. These funds trade in the same underlying market, so the spread trade is capped by tiny tracking differences unless platform defaults or institutional hedging flows change materially. Falsifiers are straightforward: if GLD continues to outgrow IAU on a sustained basis despite the cost gap, or if a volatility shock reasserts GLD's liquidity premium, the long-IAU/short-GLD thesis should be reduced quickly.

Key Decisions for Investors

• Long IAU / short GLD in a small relative-value position for 6-12 months, targeting gradual fee-differential capture and marginal flow share gain; keep sizing modest because the spread is structurally tight and liquidity can dominate in stress.
• Use IAU as the default core gold holding for strategic hedges over 1-3 years; the risk/reward is simply better net of fees unless you need GLD's options depth.
• Prefer GLD only for tactical, high-notional hedges or options expression over days to weeks; the liquidity premium is worth paying when execution speed matters more than fee drag.
• Set an alert on the GLD/IAU AUM and volume ratio over the next 1-2 quarters; if GLD retains share despite weaker economics, it signals liquidity/derivatives demand is overpowering fee sensitivity and the spread trade is not working.
• If the goal is directional gold exposure rather than wrapper efficiency, look through both ETFs and consider miners via GDX/NEM as higher-beta expressions; otherwise this article does not justify a directional gold trade.