Quotes from Richard Ferri

People who buy equity ETF shares in taxable accounts, such as a joint account or trust account, will find their tax bill may be slightly lower at the end of the year than if they had purchased the same amount in a comparable open-end index fund.

In addition to lower expense ratios on ETFs, Vanguard charges purchase and redemption fees on several open-end funds. There are no extra fees on Vanguard ETFs although there is a brokerage commission cost to buy and sell shares.