I've done both. After those experiences, here is my suggestion:
- If you need WYSIWYG and don't care
about Sharepoint's bloat and lack of
features (the wiki is simplistic, but
has the major features you need in a
wiki), go with that. It works as a
wiki and helps when business people
need to hit up the wiki -- lot less
time teaching them to use it etc.
- If you can work with barebones and
just want a simple wiki thats fast
and flexible, you can't beat
screwturn.
As for the why to use a wiki, whether screwturn or sharepoint -- it beats word docs in Sharepoint hands down. To use Sharepoint, first off you have to download the doc, edit, upload, or use Office integration which is chancy at best. Wiki's eliminate all the friction and make it dead simple to update. Eliminating friction is key, because when you have to work with word docs you end up just not updating them as often as you should. With a wiki, it's a 2 second pop in/edit/save transaction. With a word doc, it takes minutes to load word, open the doc, edit, worry about formatting, save, etc.
