VOO vs. RSP: Which S&P 500 ETF Is Better?

The article argues that the Vanguard S&P 500 ETF (VOO) is preferable to the Invesco S&P 500 Equal Weight ETF (RSP) because VOO has a 35% tech allocation versus 19% for RSP, and tech earnings are expected to keep driving markets. FactSet forecasts 44% full-year 2026 tech earnings growth, roughly double the 22% expected for the S&P 500, while Goldman Sachs sees another 13% earnings growth in 2027 with about half tied to AI infrastructure beneficiaries. The piece is largely an ETF allocation opinion, so the direct market impact is limited.

Analysis

This is less a generic “buy the index” note and more a bet on earnings concentration staying intact. The real second-order effect is that cap-weighting turns a macro view on AI into a mechanical flow bid for the same set of mega-cap beneficiaries, while equal-weight repeatedly forces capital out of winners and into lower-quality cyclicals/defensives. If tech earnings re-accelerate into 2026-27, the dispersion trade matters more than the headline index level: breadth can stay poor even as the index grinds higher.

The biggest hidden beneficiary is the AI capex supply chain, not just NVDA. Goldman’s framing implies incremental earnings are increasingly coming from infrastructure enablers, which should support suppliers with durable pricing power and high operating leverage, while squeezing downstream adopters whose margins are being diluted by capex intensity. That argues for favoring the picks-and-shovels layer over software beta, and for being cautious on any broad equal-weight rotation that depends on small- and mid-cap earnings catching up.

The main risk is timing: this trade works as long as earnings revisions remain upward, but it can reverse quickly if AI capex slows, if hyperscaler ROI scrutiny tightens, or if rate volatility compresses long-duration multiples. Over a 3-6 month horizon, the more likely failure mode is not a collapse in tech fundamentals but a valuation reset if the market starts pricing growth as already owned. That makes VOO preferable tactically, but it is a crowded expression and vulnerable to any pause in mega-cap leadership.

Consensus may be underestimating how much quarterly rebalancing mechanically sells recent winners in equal-weight funds, creating a persistent relative headwind for RSP whenever leadership is narrow. Conversely, consensus may be overconfident that tech breadth will broaden: if only a handful of AI-linked names keep compounding earnings, concentration risk rises and index investors are effectively paying for a very small number of outcomes. The opportunity is to separate durable AI infrastructure winners from index-level exposure before the market does.

Key Decisions for Investors

• Overweight VOO vs RSP for the next 1-2 quarters; express via a long VOO / short RSP pair to capture concentration and rebalancing drag if mega-cap earnings revisions continue.
• Add tactical long exposure to NVDA on pullbacks over the next 4-8 weeks, but keep size modest: the upside is continued earnings momentum, while the main risk is multiple compression if the market questions AI payback.
• Prefer GS over a broad tech basket as a relative beneficiary of sustained AI infrastructure spending; use a 3-6 month horizon and trim if capex growth visibly slows.
• Avoid a broad equal-weight rotation until there is evidence of earnings breadth outside mega-cap tech; if you want cyclical exposure, fund it out of RSP rather than VOO.
• For a more convex expression, buy 6-9 month VOO call spreads and finance part of the premium by selling near-dated RSP calls; this benefits from continued leadership with defined downside if breadth unexpectedly improves.