Hello. I’m new to this forum and DokuWiki in general, so I need to know if you take kindly to MediaWiki users :-)
Just remember that the markup is different. Don't do what a former colleague did; import pages from my DW site and paste them in a MW site - then accuse me of not knowing how to do the markup! (I've been editing WP for nearly 10 years and could tech him a thing or two).
I think MediaWiki's markup is horrible. I really, really like Dokuwiki's markup instead and that was a major factor when I decided which software to use back in 2007. I also like that Dokuwiki's files are easily-readable text files that can survive even if my database server is down and Dokuwiki is somehow broken.
I don't have any issues with mediawiki users though.
MediaWiki is ok, and I still use it on some projects, but I'd agree with StarArmy, DokuWiki's markup is way much better.
If you want a large wiki with many contributors adding information at the same time, then look to the world's largest wiki which runs on MediaWiki. If on the other hand you are running a small departmental or SoHo wiki and don't want all the hassle of databases and convoluted backup requirements, then DokuWiki would be my choice. Probably the best guide is when you get an unacceptable rate of edit conflicts or the host machine is overloaded, then consider using "big brother", otherwise KISS!