PEG = Price/Earning to Growth Rate. An indicator of whether the share price premium granted to the share price is justified by the growth of the company's net profit. AAPL 2.02 / MSFT 1.82 Both companies' growth rates look good. First of all, based on the PEG figures, MSFT seems to have a higher growth rate. AAPL itself has a larger market capitalization than MSFT, and since the two companies have different business properties, I think we can look at the rest of the indicators to see which companies are worth more investment. Actually, personally, it doesn't look bad to invest in both places :)