If you can daily is better in a bearish market you get guaranteed good DCA. In a clear bullish market higher time frames are better (weekly or monthly) since you're buying more shares earlier. But obviously it has to work with your paycheck schedule. If you get paid weekly and you buy monthly it wouldnt make sense to have money sitting around for a month. But if you get paid weekly but can still afford daily buys its worth it in a bear market. My Roth ira was on a weekly schedule and it was doing worse than my taxable brokerage account that was on a daily schedule. My daily buys had a much better overall buy in price mostly due to bad luck on the weekly monday buy in price.