Vanguard Group's Standard & Poor's 500 ETF is on the edge of finally seizing the title of the world's largest exchange-traded fund from rival State Street Global Advisors' product, the SPDR S&P 500 Trust ,

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).