Stocks had a roller coaster ride in September. Last Monday, the S&P 500 and the Nasdaq suffered their worst one-day declines since May on concerns surrounding the Chinese property developer Evergrande. They rebounded strongly later in the week particularly after the Fed signaled it may start to taper its bond purchases in November.We may continue to encounter turbulence in the coming weeks on rising concerns about slowing economic growth and the Delta variant. Despite a record rally, stocks still look attractive compared to bonds thanks mainly to ultra-accommodative monetary policy. While some investors are concerned about stretched valuations, the rally this year has been driven primarily by excellent earnings growth and most valuation metrics remain close to their levels at the beginning of the year.As growth is expected to slow down in 2022, investors have started favoring stocks with more quality balance sheets and less volatile earnings, over the past few weeks. Quality stocks have historically outperformed in mid-cycle economies when growth starts slowing.The iShares MSCI USA Quality Factor ETF (QUAL), Invesco S&P 500 Quality ETF (SPHQ) and JPMorgan U.S. Quality Factor ETF (JQUA) invest in stocks exhibiting positive fundamentals.Apple (AAPL), Microsoft (MSFT), NVIDIA (NVDA) JP Morgan (JPM) and Visa (V) are among the top holdings in these ETFs. To learn more, please watch the short video above. Zacks Names "Single Best Pick to Double" From thousands of stocks, 5 Zacks experts each have chosen their favorite to skyrocket +100% or more in months to come. From those 5, Director of Research Sheraz Mian hand-picks one to have the most explosive upside of all. You know this company from its past glory days, but few would expect that it's poised for a monster turnaround. Fresh from a successful repositioning and flush with A-list celeb endorsements, it could rival or surpass other recent Zacks' Stocks Set to Double like Boston Beer Company which shot up +143.0% in a little more than 9 months and Nvidia which boomed +175.9% in one year.Free: See Our Top Stock and 4 Runners Up >>Want the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report JPMorgan Chase & Co. (JPM): Free Stock Analysis Report Apple Inc. (AAPL): Free Stock Analysis Report Microsoft Corporation (MSFT): Free Stock Analysis Report Visa Inc. (V): Free Stock Analysis Report NVIDIA Corporation (NVDA): Free Stock Analysis Report iShares MSCI USA Quality Factor ETF (QUAL): ETF Research Reports Invesco S&P 500 Quality ETF (SPHQ): ETF Research Reports JPMorgan U.S. Quality Factor ETF (JQUA): ETF Research Reports To read this article on Zacks.com click here. Zacks Investment Research