# VOO vs VTI vs SPY: Which Index ETF Should You Actually Buy?
If you have spent any time researching how to invest, you have run into these three tickers: VOO, VTI and SPY. They are three of the most popular exchange-traded funds in the world, and they get recommended constantly. But here is the thing nobody tells beginners clearly: they are not interchangeable. Picking the right one comes down to a few simple differences. Let us break it down in plain English.
The Quick Answer
If you want the short version:
- VOO tracks the S&P 500 (the 500 largest US companies) with a rock-bottom fee. Great core holding.
- VTI tracks the entire US stock market (about 3,600 companies, including small and mid-caps) for the same low fee. Slightly more diversified.
- SPY also tracks the S&P 500, but costs more. It is built for traders, not long-term buy-and-hold investors.
For most long-term investors, VOO or VTI is the better pick, and the choice between them is smaller than you think.
VOO vs SPY: Same Index, Different Price
This is the easiest comparison, because VOO and SPY track the exact same thing: the S&P 500. If you want to understand that index itself, we explain it fully in What Is the S&P 500?.
So if the holdings are identical, why choose? Cost. VOO has an expense ratio of about 0.03%, while SPY charges roughly 0.09%, three times more. That gap sounds tiny, but on a large balance over 30 years, paying triple the fee for the identical portfolio is simply throwing money away.
So why does SPY still exist and trade billions of dollars a day? Because it is the oldest and most liquid ETF on the market, which makes it the favorite of professional traders and options players who care about tight spreads, not 30-year fees. If you are a long-term investor, that liquidity does not benefit you, and the higher fee actively hurts you. VOO wins for buy-and-hold.
VOO vs VTI: 500 Companies or the Whole Market?
This is the more interesting debate, because both are cheap (around 0.03%) and both come from Vanguard. The difference is what they own.
- VOO holds the S&P 500: the 500 largest US companies, roughly 80% of the total US market value.
- VTI holds the total US market: those same large caps plus thousands of small and mid-sized companies.
In practice, their returns are very similar, because the giant companies (Apple, Microsoft, Nvidia and friends) dominate both funds. VTI just adds a tail of smaller companies on top. The case for VTI is broader diversification and exposure to the next generation of winners while they are still small. The case for VOO is that you own the highest-quality, most profitable companies with slightly less volatility.
Honestly? You cannot go badly wrong with either. Pick VTI if you want to own "everything" and never think about it again; pick VOO if you prefer a focus on established blue chips.
How to Decide
Ask yourself one question: am I investing for the long term, or trading?
- Long-term investor: choose VOO or VTI. Both are cheap, diversified and ideal as a core holding you buy regularly. This pairs perfectly with a strategy like dollar-cost averaging.
- Active trader: SPY's liquidity is useful, but that is a niche use case, not a reason for most people to own it.
If you are still deciding between an ETF and a traditional fund at all, our guide on ETF vs Mutual Fund covers that first step.
You can compare the live prices, holdings and performance of all three on their pages: VOO, VTI and SPY, or screen for other funds with our Stock Screener.
Watch Out for the Free Lunch That Isn't
One last tip: do not buy all three. Because VOO, VTI and SPY overlap so heavily (they are all dominated by the same mega-cap stocks), owning more than one does not really diversify you, it just gives you the illusion of diversification while holding nearly the same portfolio twice. Pick one as your US core and build around it with different asset classes instead.
The Bottom Line
VOO, VTI and SPY are all excellent, low-cost ways to own the US market, but they serve different jobs. For the vast majority of long-term investors, VOO or VTI is the smarter, cheaper choice, and SPY is best left to traders.
Our take: For a simple, low-cost core holding, we lean toward VOO (S&P 500) for its blend of quality and rock-bottom cost, or VTI if you want maximum diversification in a single ticker. Whichever you choose, the winning move is the same: buy consistently, keep fees low, and let time and compounding do the heavy lifting.---
This article is for informational purposes only and is not financial advice. Always do your own research before investing.
