• Forums are a lot simpler, faster, and easier to contribute to than a wiki, especially for beginners.
• Formatting rules don't have to be strict on a forum.
• Forums are designed for interaction, and while wikis allow it, it's not terribly fun to interact with people on a wiki by comparison.
• With a forum, regular members can't come in and ruin or vandalize all your work. They merely add to it with discussion, or they make a post of their own. Administrators have more power.
• It's a lot easier to track recent changes.
• You can combine the article page and talk page into one thread.
• You can't erase someone else's mistakes (unless you're an administrator or such).
• Linking has to be done with URLs (not page titles).
• Categories of categories isn't really a thing, nor are category articles.
• Don't count on articles being in alphabetical order. (But you can easily search for them.)
• Making fancy-looking references is harder.
Location: SW Idaho, USA
USDA hardiness zone: 6
Elevation: 2,260 feet Profile post