Investing in exchange-traded funds (ETFs) is a sound strategy for long-term investors. The drawback of investing in ETFs, however, is that you can sacrifice gains for the sake of diversification and reducing your overall risk. But with growth-oriented funds, you can still achieve some impressive, market-beating returns.

Two funds that have outperformed the S 500 and more than doubled in value in the past five years are the Invesco QQQ Trust (NASDAQ: QQQ) and the Vanguard Growth ETF (NYSEMKT: VUG). Here's a look at why these funds have done so well, and whether you should consider adding them to your portfolio.

The Invesco QQQ Trust is a popular fund as it gives investors exposure to some of the best growth stocks on the market, specifically the 100 largest non-financial companies (by market cap) on the exchange. And with an expense ratio of just 0.2%, investors won't have to worry about fees taking an oversized chunk out of their returns.

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Source Fool.com