Is VOO or VTI better?

Neither is clearly better — VOO is the S&P 500 (large-cap), VTI is the total US market (adds mid/small-caps). They perform very similarly and both are excellent low-cost core holdings. The choice is a preference, not a mistake either way.

Can I hold both VOO and VTI?

You can, but it's largely redundant — they overlap heavily, so holding both doesn't add meaningful diversification. Most investors pick one as their US-equity core.

What's the main difference between VOO and VTI?

VOO holds ~500 large-cap stocks (the S&P 500); VTI holds the entire US market (3,000+ stocks, including mid and small caps). VTI is broader; VOO is large-cap only.

VOO vs VTI: S&P 500 or Total US Market — Does It Matter?

5 min read · Updated 2026-06-15

VOO and VTI are two of the most popular index ETFs, and new investors agonize over which to pick. The honest answer: they're far more alike than different — but the distinction is worth understanding.

Here's what each one actually holds, the real (small) difference, and how to compare them on your own. This is educational, not a recommendation.

Compare VOO and VTI →

What each one tracks

VOO tracks the S&P 500 — roughly the 500 largest US companies. VTI tracks the total US stock market — those same large companies plus thousands of mid- and small-cap stocks (3,000+ holdings in all). So VTI contains essentially everything VOO does, and then some.

How different are they really?

Less than you'd think. Because both are weighted by company size, the giant large-caps dominate each fund — so VTI's portfolio overlaps heavily with VOO by weight. Their historical returns track very closely and they're highly correlated. The difference is the slice of mid- and small-caps VTI adds, which can help or hurt in any given period but rarely changes the big picture.

The case for each

VOO: pure large-cap US, the classic benchmark, slightly more concentrated in the biggest names. VTI: broader diversification across the whole US market, capturing small/mid-caps that occasionally outperform (with a touch more volatility). Both are sound, ultra-low-cost core holdings.

Fees and the bottom line

Both are extremely cheap (expense ratios around 0.03%), so cost isn't the deciding factor. The practical takeaway: pick one as your US-equity core — don't hold both, since they overlap so heavily that owning the two together adds redundancy, not diversification.

Check it yourself

Rather than take anyone's word, compare VOO and VTI directly: look at how tightly they correlate and backtest both over the same period to see how small the gap really is. Then decide which fits your plan.

Try it yourself

Asset CorrelationsSee how tightly VOO and VTI actually move together.Open tool →Backtest PortfolioCompare VOO vs VTI on the same timeline.Open tool →Stock FundamentalsLook up the holdings and metrics behind each.Open tool →

FAQ

Is VOO or VTI better?: Neither is clearly better — VOO is the S&P 500 (large-cap), VTI is the total US market (adds mid/small-caps). They perform very similarly and both are excellent low-cost core holdings. The choice is a preference, not a mistake either way.
Can I hold both VOO and VTI?: You can, but it's largely redundant — they overlap heavily, so holding both doesn't add meaningful diversification. Most investors pick one as their US-equity core.
What's the main difference between VOO and VTI?: VOO holds ~500 large-cap stocks (the S&P 500); VTI holds the entire US market (3,000+ stocks, including mid and small caps). VTI is broader; VOO is large-cap only.

Key terms in this guide

Plain-English definitions in the Learning Hub.

Correlation →Benchmark correlation →CAGR (Compound Annual Growth Rate) →

Stop guessing — run the numbers on your own portfolio, free.