Assuming an investor owns the stock in a taxable account, dividends are taxed at ordinary income whereas if the stock appreciates due to stock buybacks, it could be taxable as a long-term gain (if held for more than a year).
https://mebfaber.com/2016/05/02/much-dividends-costing/
>>> In a taxable account dividends could have cost you anywhere from 0.3% to over 3.0% in returns PER YEAR since 1974.