MS Business Premium is recommended for Small Businesses. It offers all the features of the Standard Package but has some great security features that, if configured correctly, help secure your data and the data of your clients. The Business Standard package is most common for small businesses, as it offers all the features of the cheaper plans, with the bonus of getting access to desktop versions of Office 365 apps for PC and Mac. However, you do risk not protecting your data and that of your clients.