I think Zotero works much better for bibliographic management and as a
citation tool. I think Scribe is far superior as a research tool. The
timeline and outline tools are very helpful to me as is the ability to
build bibliographic information around the "author" records. The
ability to link between records is also far superior in Scribe in my
opinion.
For some time now the Zotero forum has been claiming it will enhance
the application so that it includes similar features but they have yet
to materialize and there is no word of when they will appear. Also, as
my Zotero database grows it becomes increasingly sluggish. Perhaps it
will improve with integration into the upcoming version of Firefox.
But at this point I am questioning whether I might not try to cut my
losses and begin the work of exporting my Zotero library out into
BibTex (and selectively into Scribe).
-Matthew