NEW YORK ( TheStreet) -- Plenty of investors rely on funds that track the Russell 2000 and Russell 3000 benchmarks. Among the most popular ETFs are iShares Russell 2000 ( IWM), a small-cap portfolio with $25 billion in assets, and iShares Russell 3000 ( IWV), a total market fund. Now SPDR has introduced competing offerings that come with lower expense ratios. The new SPDR Russell 2000 ( TWOK) charges 0.18%, compared to 0.23% for the iShares competitor. The fee reductions make it more tempting for investors to try Russell funds. But even with the cost reductions, the Russell ETFs may not be the best choices for typical retail investors. Instead of using the Russell 3000, many investors should prefer Vanguard Total Stock Market ETF ( VTI), says Rick Ferri, founder of Portfolio Solutions, an investment manager that relies on index funds. Ferri prefers the Vanguard fund because it holds all the 3,200 stocks in the CRSP U.S. Total Market Index, a benchmark that covers almost the entire market. In contrast, the Russell 3000 includes fewer stocks, eliminating some microcaps that CRSP includes. "With Vanguard, you truly get the total stock market," says Ferri. The iShares Russell 3000 ETF holds 2,900 stocks, and its returns will closely track the Vanguard fund. Still, the microcaps could give Vanguard an advantage. Over long periods, microcaps have outdone large stocks. During the past 10 years, the Russell 3000 index returned 8.0% annually, compared to 8.7% for the total CRSP benchmark, according to Morningstar. In periods when microcaps lag, the Vanguard fund could trail. But no matter which stocks the market favors, the Vanguard fund could hold an important advantage, because it has a tiny expense ratio of 0.05%, compared to 0.20% for the iShares 3000. Another cheap choice is Schwab U.S. Broad Market ETF ( SCHB), which charges 0.04%. But the Schwab fund only holds 1,900 stocks. Some financial advisors argue against holding the Vanguard fund, or any other total-stock-market portfolio. Instead, the advisors prefer owning three separate funds, including portfolios of large, mid-cap and small stocks. That way, the advisors can adjust holdings, emphasizing large stocks one year and small the next. But such tactics can result in trading that produces brokerage costs and potential tax bills. To limit costs, Michael Rawson, a Morningstar analyst, suggests that investors start with Vanguard Total Stock Market as a core holding that covers all the bases. To emphasize small stocks occasionally, investors can then buy a separate fund and add it to the portfolio.