The S&P 500 (SNPINDEX: ^GSPC) is arguably the stock market's most important index. It tracks the 500 largest U.S. companies on the market, and it has become the benchmark for U.S. and international investors.

The oldest exchange-traded fund listed in the U.S. has just been surpassed in assets under management by a Vanguard ETF that more cheaply tracks the S&P 500 index.

With Vanguard taking the top place among the ETF providers, it is now time to consider two of its ETFs with over 10% upside potential in the next 12 months. These include Vanguard Communication Services ETF (VOX) and Vanguard Dividend Appreciation ETF (VIG).

When it comes to investing in exchange-traded funds (ETFs), investors have many choices. You can follow the latest artificial intelligence companies with an AI ETF, or even dip your toe into cryptocurrencies with a Bitcoin ETF.

Retail investors are getting into the idea of passive investing and we’ve seen a steady increase in the funds poured into ETFs. A top choice for investors, Vanguard has set a gold standard for low-cost funds that are ideal for long-term investors.