PliR
Kain-Senpai
What ever I feel at the moment, to be honest. I try not to stick to one particular opening post style. To me, that would get too easy too quickly. Granted, I hardly make topics in the GCD, but when I do I try to open them up differently. It's fun that way!
I didn't mention the GCD. I don't think. >.<; What forum do you post in?
Given that many other forums, most of the styles you suggested aren't really applicable, like Word Games, or Chatterbox, for example. But it's nice to consider what works best for each forum, too!
The discussion forums are probably best suited to some of the longer form OP styles, though they often do appear in question or anecdote format.
I kind of think the best topic is one that attempts to blend a few styles. Such as including questions that are relevant to the discussion within the OP or at the end, and keeping the discussion reasonably brief. If one wishes to state one's own opinion or experience in a topic, it is better to discuss that as it comes up within the topic rather than bog the OP down with your own answers to the discussion points you're raising. It then begins to feel like a journal post rather than something the OP wishes to explore.
At least, keep the anecdotes and personal opinions brief in the OP, and only include them if they add weight to your discussion points.
Not that I'd know s**t, I never make topics.