You can use both tools at the same time
You can share Zotero libraries with colleagues who use Endnote and vice versa
Both managers can read&write a standard citation style format RIS
Moving Zotero library to EndNote:
1. To save your Zotero library, click "File" and choose "Export Library." Choose RIS as the file type and pick a filename.
2. To import your Zotero library to EndNote, click "File" and then "Import." Click the "Choose File" button and select the file you just exported from Zotero. Set Import Option to "Reference Manager (RIS)" and click Import
Moving Endnote library to Zotero:
1. To export your EndNote library for use in Zotero, click "File" and then "Export." Set the output style to "RefMan (RIS) Export" and save it as a text file.
2. In Zotero, click "File" and choose "Import." The new references will be added to a collection named "Imported" followed by the date and time.