Framemaker vs XMetal for structured authoring

[Andersen, Verner Engell VEA]

Hi
I currently use unstructured Framemaker for pdf output. I single-source
my content - and via Webworks Publisher I output to context-sensitive
help in Webworks help format.
 
My 5 colleagues use Word and output to pdf for printing. We plan to go
structured and are considering whether we should use Framemaker or
XMetal.
 
Do any of you know where I can find an unbiased comparison of the two
tools?
 
I have been told that the major disadvantage of using Framemaker is that
you are required to save in binary format to keep the
Framemaker-specific XML processing instructions (pls). If you store in
xml-format you cannot retrieve and maintain conditional text. Callouts
on drawings (the graphics tool in Framemaker) will be rasterized, and
even paragraph styles can be discarded if you save a document as XML.
 
What are the implications of sacrificing saving documents as XML? 
 
Another advantage in favor of XMetal should be that it has
vendor-supported integration with most content management systems (CMS).
Apparently XMetal seems to be the best choice. 
 
What are your comments?
 
Thanks,
 
Verner
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