Zotero and DEVONThink are apps built for entirely different purposes.
Zotero is a reference manager, it helps you manage your citations and if integrated with other apps in your workflow to automatically pull and insert your citations in your work. It does have limited file storage and the new version is introducing a PDF viewer and highlighter.
DEVONThink is a powerful document repository tool with deep AI and machine learning capabilities for document discovery and management. While you can add citation keys to your files in DEVONThink, as it stands now DEVONThink is not going to help you automatically format and manage your citations.
The beauty of Tinderbox is that you can use with for what it does best, 4Cs of knowledge management, and use other speciality apps for what they do best.