I own a business and also have personal rental properties...which version should i buy?

I assume you are asking about preparing your personal income taxes, not referring to an income tax return that needs to be prepared by "the business" and separately filed.  (The latter requires TurboTax Business, not Home & Business.)

All the desktop versions support the exact same Forms, Schedules and Worksheets so, in theory, any income tax return can be prepared by any version.  As you go up the price chain you get more hand-holding, more specific directed interviews in areas that are most likely needed by most taxpayers.  The general recommendation here if you think you won't need to much hand-holding and are comfortable entering some information in "Forms mode", (i.e., not entering all you information through the interviews themselves), is to start with Deluxe.  If you feel you need more help or there are subjects not directly addressed through the interview you can always upgrade "on the fly", paying only the differential between the version you're using and the version you're upgrading to.

Tom Young