[dokuwiki] dash or underscore as word seperator in url for search engine indexation

Hello,

After some search on this mailing list, I could not find any message
regarding the best choice in the use of dash "-" or underscore "_" as
word seperator in url for search engine indexation.

Why this question?
Because I made some search, and it seems that it is much better to use
the dash "-" than the underscore "_" to separate words.
So this first example will be better referenced by Google:
http://www.example.com/dokuwiki/discover-the-use-of-the-wiki-tool
Than this one:
http://www.example.com/dokuwiki/discover_the_use_of_the_wiki_tool

Here are some references regarding this subject:
http://www.mattcutts.com/blog/dashes-vs-underscores/
http://orderedlist.com/articles/an-underscore-solution
http://forums.searchenginewatch.com/archive/index.php/t-6460.html
And more with this google search:
http://www.google.com/search?q=seo+dash+underscore

Personnaly, I prefer underscore to separate words, I find this more readable.
However, I set up my Dokuwiki to dash separator in order to improve my
Google ranking (using the $conf['sepchar'] variable).

What are your thoughts on this subject?

Yann
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