Earlier quoted context omitted.
This is not actually true anymore, Fidelity has responded. Their pure index funds are extremely competitive with Vanguard.
Most of the major players have funds with expense ratios within a couple basis points of each other. When they're that close, picking the fund with the lowest expense ratio may not result in the best performance and other factors can dominate: - How well the fund is run, and how representative it is of the index. A fund with high trading costs may underperform. - Securities Lending policy, how risky it is and how muc…
>In most cases, it wouldn't make sense to switch existing funds to another provider in a taxable account if switching would result in a large capital gain.
As long as the the funds track the same index then it's a Section 1031 like-kind exchange which does not trigger capital gains.
[0] https://www.irs.gov/newsroom/like-kind-exchanges-under-irc-c...