FTSE All-World vs S&P 500: how beginners choose

The S&P 500 is an index of roughly 500 of the largest companies listed in the United States, including Apple, Microsoft and Nvidia. A fund tracking it, such as Vanguard's VUAG or iShares' CSPX, gives you a slice of corporate America and nothing else.

The FTSE All-World, maintained by index provider FTSE Russell, is a much longer list: roughly 3,600 companies across about 50 developed and emerging markets. Developed means rich, stable economies like the US, Japan and Germany, while emerging means faster-growing but bumpier ones like India, Taiwan and Brazil. A fund tracking it, such as VWRP or VWCE, owns a slice of nearly everything.

Because American companies are worth so much, the All-World is itself about 60% US. So the decision is not really "US or not US"; it is only the US, or the US plus everyone else.

Both choices are cheap and respectable, both are run by the same handful of giant fund managers, and neither is a trap. That is exactly why forums argue about it endlessly: there is no product flaw to point at, only a judgment call about concentration that different people weigh differently.

Here is the fact that surprises most beginners: virtually every company in the S&P 500 is also inside the FTSE All-World. The overlap runs almost entirely one way, so the All-World is essentially the S&P 500 plus about 3,100 additional companies from the rest of the world.

You are never choosing between two different sets of businesses, only between the concentrated version and the extended one. It follows that the top holdings of both funds are the same handful of US mega caps, the trillion-dollar giants at the top of the market.

Open the official factsheets for VWRP and CSPX and the top ten reads almost identically, with Apple, Microsoft, Nvidia and Amazon near the top of both lists.

This one-way overlap has a consequence worth planting now: if you already own an All-World fund and add an S&P 500 fund on top, you are not adding new diversification. You are increasing the weight of companies you already own, and we come back to that in the buy-both section below.

Our data updates with every refresh, so treat the exact figures here as a snapshot rather than gospel; the live FTSE All-World vs S&P 500 chart always shows the current numbers.

The five-year gap is big, and it is exactly why so many people online insist the S&P 500 is the obvious choice. But the twelve-month reversal is the honest lesson of the whole comparison: nothing dramatic happened, markets outside America simply had a better year.

Leadership rotates. The US winning streak of the 2010s was real, but it is history rather than a law of nature, and there have been long stretches, such as the 2000s, when international markets beat the S&P 500.

The standard caveat genuinely matters here: past performance tells you what happened, not what happens next. Anyone picking a fund purely on its last five years is really betting that the recent past continues, which is a bet, not a fact.

Start with fees. Every fund charges a TER, or total expense ratio, an ongoing annual fee taken quietly out of the fund itself rather than billed to you.

In our data the S&P 500 UCITS ETFs all charge 0.07% a year, whether you buy CSPX, VUAG or VUSA, while the FTSE All-World funds (VWRP and VWCE) charge 0.22%. UCITS is the European rulebook for funds sold to everyday investors, and our guide to what a UCITS ETF is unpacks the label properly.

That sounds like a threefold difference, and technically it is, but the gap is 0.15% a year, which on a 10,000 pound pot works out to about 15 pounds a year. That is real money and worth knowing about, but it is nowhere near the biggest factor in this decision.

Our guide to accumulating vs distributing ETFs walks through that share-class fork properly.

Both funds are Irish-domiciled UCITS ETFs, meaning legally based in Ireland under European fund rules, and that matters for anyone outside the US. Irish-domiciled funds pay 15% US withholding tax on dividends from their American holdings instead of the 30% that many other structures pay.

The case against is concentration. It is one country, one currency bloc and one political system, and a handful of giant technology companies make up a large slice of the index. If the US has a bad decade, and it has had them before, your entire portfolio has a bad decade with it.

The case for the All-World is that it never asks you to make that call. It holds everything, and as countries rise and fall the index reweights itself automatically.

If the next decade belongs to India or Japan or Europe, you will own it without lifting a finger, while still keeping about 60% in the US for as long as the US stays dominant. The price is a slightly higher fee and, over the recent past, a lower return.

Neither side is wrong. These are trade-offs that people weight differently, and either fund, bought regularly and held for decades, has historically served investors far better than sitting in cash waiting for certainty.

The most upvoted compromise in the forum threads is holding both, often VUAG and VWRP side by side, and it feels like diversification. The math says otherwise.

The All-World is already about 60% US, so a 50/50 split of the two funds works out to roughly 80% US overall: half your money at 100% US plus half at 60% US. You have not added a single company the All-World did not already own; you have simply turned the US dial up from 60 to 80.

There is nothing wrong with that if it is deliberate. Plenty of thoughtful investors run a US tilt, meaning a bigger weight in America than the world market would give them, because they believe in US earnings power. But a tilt should be a decision made on purpose, not a side effect of buying two popular tickers.

Two funds also means a second thing to monitor, rebalance (nudge back to your target split when it drifts) and second-guess. A single core fund is easier to stick with through a crash, and sticking with it is what actually compounds.

If part of your confusion is which S&P 500 ticker is which, the CSPX vs VUAG chart lines the iShares and Vanguard versions up directly, and VUAG vs VUSA shows the accumulating and distributing pair.

If your answers lean towards "a bad US decade would rattle me" and "I never want to think about this again", the world fund is the natural fit, because it is built to be held without opinions. If you have genuine conviction in the US, can stomach the swings that come with concentration, and like the lower fee, the S&P 500 case is coherent too.

Notice how much the two outcomes share: both give you the American giants, both are cheap, and the choice matters far less than starting at all and continuing through the boring years. Whichever side wins, people who picked one fund and bought it monthly have historically done far better than those who waited for the perfect answer.

UK investors can hold either inside an ISA, a tax wrapper that shelters gains and dividends from UK tax; other countries have their own wrappers, so check your local rules.

Then, if you want to see the trade-off rather than imagine it, the live chart from the performance section above puts both funds on one graph, and the investment calculator lets you test what a monthly amount could grow into under each fund's historical return.