PBWiki vs. other document management solutions. Help!

I am working with a client who already uses PBWiki, and I am trying to figure out whether PBWiki would be the best choice for their document management system or whether a more traditional document management system would be better.

Currently, various people in the firm have documents on their hard drives, or share documents through an online file sharing tool. I am wondering if, for an existing collection of potentially hundreds of documents (proposal letters, engagement letters, formal reports), PBWiki makes sense. I know it has folders, tags and search capability.
 
silly I’m unsure
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