You can use the DMG image or the Zip file provided by Talend to install Talend Studio.
Talend recommends to use the DMG image.
When installing Talend Studio, either using the installer or manually, a minimal version with some basic Data Integration features is installed. After Talend Studio installation, to use those features that are not shipped with Talend Studio by default, you need to install them through the Feature Manager. For more information, see Installing features using the Feature Manager.