TurboTax Business is for filing Corporate (Form 1120) S-Corporation (Form 1120-S) Partnership (Form 1065) and Fiduciary (Form 1041).  TurboTax Home & Business is for self-employed taxpayers filing Schedule C.  TurboTax Deluxe has more features than Basic, but doesn't handle as many situations as Premier.  For additional information see the following links:

TurboTax Desktop Products Comparison

TurboTax Business