MSCI World vs S&P 500: Which ETF Should You Choose?

This is the most common ETF selection question among European investors. The S&P 500 tracks 500 US large-cap companies. The MSCI World tracks approximately 1,500 companies across 23 developed countries. Over the past decade, the S&P 500 has outperformed MSCI World by 2-3% annually, mostly due to US tech dominance. But does past US outperformance justify concentrating your portfolio in a single country?

Quick Answer

Both are good cores; the choice is how much US exposure you want, not returns. The S&P 500 tracks 500 US large-caps, while MSCI World holds ~1,500 companies across 23 developed countries (US ~70%, Europe ~15%, Japan ~6%). Over the past decade the S&P 500 beat MSCI World by 2-3% annually, driven by US tech — but entire decades (2000-2009, the 1970s) favoured non-US markets. S&P 500 ETFs cost 0.07% TER vs ~0.20% for MSCI World. A single broad fund like VWCE (US ~62%) removes the decision entirely.

---

The data

Historical returns (annualised, USD)

The S&P 500 has won convincingly over the recent period. But this was not always the case.

When international markets won

There are entire decades where non-US developed markets outperformed the US. The current US dominance is not permanent.

The case for S&P 500 only

1. US companies are global. Apple, Microsoft, Google, Amazon earn 40-60% of revenue outside the US. You get global exposure through US-listed multinationals.
2. Superior recent performance. US tech innovation has been extraordinary and shows no signs of slowing.
3. Deeper, more liquid market. US market structure, corporate governance, and shareholder rights are stronger.
4. Lower TER. S&P 500 ETFs cost 0.07% vs 0.20% for MSCI World. Small difference but it compounds.

The case for MSCI World

1. Geographic diversification. The S&P 500 is 100% US. MSCI World spreads risk across 23 countries (US ~70%, Europe ~15%, Japan ~6%, others ~9%).
2. Mean reversion. US outperformance is cyclical, not permanent. The next decade could favour Europe or Asia.
3. Concentration risk. The top 7 US stocks (Magnificent Seven) make up ~30% of the S&P 500. A sector rotation away from tech would hit S&P 500 disproportionately.
4. Currency diversification. For a PLN-based investor, MSCI World provides exposure to EUR, GBP, JPY, and CHF alongside USD.

The practical answer

If you can only hold one ETF

VWCE (Vanguard FTSE All-World) solves the problem entirely. It includes both US large-caps (same as S&P 500) and international developed + emerging markets. Current US weight: approximately 62%. You get the best of both worlds without needing to make an active allocation decision.

If you want to customise

• 70% IWDA (MSCI World) + 15% EMIM (Emerging Markets) + 15% bonds (AGGH) — Developed + emerging markets globally, no active US bet
• 50% CSPX (S&P 500) + 30% IWDA (MSCI World) + 20% other — Overweight US while maintaining international diversification
• 100% CSPX — Maximum US concentration. Only choose this if you have strong conviction in continued US outperformance and can tolerate the concentration risk.

The honest advice for most Polish investors

Buy VWCE. It removes the MSCI World vs S&P 500 decision entirely. The 0.22% TER is slightly higher than CSPX's 0.07% but the diversification benefit is worth far more than 0.15% per year. You will never regret having owned the entire world.

Track your equity allocation by geography in Freenance. Whether you hold VWCE, IWDA, CSPX, or a combination, seeing your US vs international exposure helps you understand your portfolio's true diversification.

Related Articles

• IWDA Review — Deep dive into the MSCI World ETF
• S&P 500 ETF: How to Buy in Poland — Buying guide
• Bogleheads Three-Fund Portfolio — Portfolio construction framework

FAQ

Is MSCI World really diversified if 70% of it is US stocks?

MSCI World is weighted by free-float market cap, so the roughly 70% US share reflects how dominant US companies currently are in global developed-market value. It still adds meaningful exposure to Japan, the UK, Europe and Canada compared with a pure S&P 500 holding. Investors looking for less US concentration can add emerging markets or use alternative indices that cap country weights.

Has the S&P 500 always outperformed international markets?

No — the S&P 500's recent strong outperformance is a feature of the last 10-15 years, driven largely by US technology. There were extended periods, such as 2000-2009 and parts of the 1970s and 1980s, when non-US developed markets outperformed the US. Past relative performance does not predict which region will lead in the next decade.

Do I lose US exposure if I choose MSCI World over the S&P 500?

No — MSCI World already includes the same large US companies you would get in the S&P 500, just at a lower weight alongside other countries. You still own Apple, Microsoft, NVIDIA and similar US giants through MSCI World. Choosing MSCI World is mostly a decision about how much non-US exposure you want, not whether to own US stocks at all.

Is the lower TER of S&P 500 ETFs a strong reason to prefer them?

S&P 500 ETFs often have a TER around 0.07% versus roughly 0.20% for MSCI World ETFs, which is a real but modest difference. Over long horizons that cost gap compounds, but it is typically smaller than the impact of country and currency diversification choices. For most long-term investors the diversification trade-off matters more than the 0.13 percentage points of cost.

Which option is more practical for a Polish long-term investor?

Many Polish investors use a single broad fund such as VWCE, which combines developed and emerging markets and avoids the MSCI World vs S&P 500 decision entirely. Holding such a fund inside an IKE or IKZE can also reduce the impact of the 19% Belka tax. The specific allocation should match your risk tolerance, time horizon and existing exposures rather than recent return rankings.

---

This article is educational and not investment advice. Neither index nor any ETF mentioned is recommended; verify current data and consider your own circumstances or a licensed adviser before investing.