If you are a small company or doing only minor editing of Office documents, then the web version can be more then sufficient. So you get Word, Excel, Outlook and Onenote, but only the web version of it.
The Office 365 E1 version is focussed on the Online version only. If you want to compare all the Office 365 version, make sure you check this article about all the business and enterprise versions. I added a comparison chart at the end of this article so you get a nice overview of the major differences. What are the differences between Office 365 E1 vs E3? Below you will find the major differences to help you choose between the two enterprise version.
