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However, given that DFA funds have performed better than the vanguard/msci equivalent, it's not so clear cut to me which is the better option. For example, 10-year return of the US-small-value fund DFSVX is 9.65% vs 7.48% for VISVX. I guess this is maybe the 1% better statistical performance that another poster mentioned.
Comparing a Vanguard fund to a DFA fund with a similar name is a common way to compare them, but it is not the right way to compare them, since they actually hold different stocks. One should compare portfolios with the same asset allocation and not the same fund names.
For example, for two portfolios of different funds, in order to call them equivalent one would want
(a) the Morningstar 9-box style grid to have similar numbers in each of the 9-boxes so they have the same breakdown of large-cap, mid-cap, small-cap, value, blend, and growth stocks.
(b) the same percentages of US stocks, developed international stocks, emerging markets stocks, REITs, bonds, etc.
(c) the same average market cap for US, foreign, and emerging separately and together,
It is a mistake to just take the same percentages of funds with similar names. You really should want the innards of your portfolio to match up with the innards of the compared portfolio.
Generally, if you can get your innards for lower cost, you will come out ahead. One must also take advantage of portfolio management operations such as rebalancing and tax-loss harvesting. If you do not have the mindset to do these things, maybe you can find an advisor to do these things for you since they may be worth an additional 1% to 2% annually to your portfolio return. Of course, you won't come out ahead if you pay that advisor 1% to 2% to do rebalancing and tax-loss harvesting for you.