Any impressions of Zotero iOS beta vis-a-vis DTTG?

As a new-ish user of Zotero and DT and DTTG, I apologize in advance if my questions are naive!

Is anyone on the Zotero iOS beta? And if so, any impressions of using Zotero iOS beta on iPad as compared with using DTTG on iPad to manage and annotate article PDFs…?

Thanks in advance for any information.