I don't like to speak at a mini-symposium unless I am really confident that I have something dramatic, new and really substantial to discuss. If I don't feel that way, then a poster makes a lot more sense. Everybody has stage fright the first time, so to defer dealing with your stage fright is never a good reason not to do a podium presentation. I think it is only a matter of practice. The people who sound wonderful when they are up there did not sound wonderful the very first time they did it.
Practice does make perfect.
If you have data that can fly as a presentation, then you should not defer the presentation because you feel your stage presence is not what it should be. It will be what it needs to be as long as you practice it. Anything that is presented at the meeting is listed in the journal without any indication as to whether it was a poster or a podium presentation. That brings me to my second point. In fact, in the ideal world, for every abstract there should be a subsequent manuscript with a similar or the same title.