He will need to use TurboTax Business for the Form 1120S. Here is a link for more information: TurboTax Business
For his personal return, he will be using one of the personal tax products. Choosing the right one will depend on the complexity of his return, not only with his income, but deductions as well. Use this link to learn more about the different options: Compare TurboTax Products
If you choose one version of the personal TurboTax and find that a higher version was needed due to a certain type of income or deduction, then the program will allow you to upgrade without losing any of your work that has already been done.