Also, almost nobody thinks the S&P5 is worse than the Dow. I'm not sure how you can back that up.
(If you actually want to index, though, a total market fund makes much more sense)
Also including 500 big companies is much more reasonable than including just 30.
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People lately criticize S&P committee for the rule that a company needs to report 4 consecutive profitable quarters in a row to be included. Thanks to this they've missed the boat on Tesla and they had to eventually include it as the 8th largest component.
Someone on this forum joked that they should amend the rule to say: A company needs to report 4 consecutive profitable quarters in a row and the CEO name must not rhyme with melon tusk.
There are funds that are more diversified than funds tracking S&P (e.g. $VOO tracks S&P 500). $VTI should represent the total US market. $VWRL should represent the total worldwide market.
Not sure about “better to own” though - that depends on your risk profile. Of course both of them underperformed S&P 500 in the recent history.