A seemingly unstoppable flood of money has Vanguard Group Inc. on the brink of claiming a crown that State Street Corp. has held for decades.

The Vanguard Growth ETF and Vanguard Value ETF are two simple yet effective ways to invest in small pieces of hundreds of large-cap stocks. But the Vanguard Growth ETF has become less diversified in recent years, whereas the Vanguard Value ETF is still very diversified, even with its focus on financials, industrials, and healthcare.

Vanguard exchange-traded funds (ETFs) are a fantastic choice for retired investors looking to play the long game with their portfolios. Undoubtedly, Vanguard is a name that passive investors can put their trust in.

Having one or two go-to ETFs to invest in every month can make investing a breeze and save you a lot of time. The key is, however, to find some solid ETFs you can trust and feel confident about, knowing that you're putting your money into the best fund suited for your strategy.