User blog comment:Flightmare/Introducing the new Wikia forum./@comment-5675031-20130111034416/@comment-770155-20130111140609

It depends on how deep you want to go into discussing it. When the discussion itself would be the most important thing of the speculation, the forum would be most suited. When you feel like writing a lengthy article on the speculation, blogs might work out somewhat better. But for most cases using the forum would be the preferred option.