Like others here, I will usually sit if I'm in a club singaround.

But if I'm actually performing, it's a little different. Standing makes me more visible, especially if I'm on the same flat level floor with the audience. Partly for that reason, I think it's better showmanship to stand. I feel there's a psychological advantage with the audience, standing.

Now, when playing and singing with the banjo it wouldn't make any operational difference whether I'm standing or sitting, but when I'm singing with the guitar something else comes into play. My guitar is a classical guitar, without shoulder strap or cord. I need the left knee. So I will use a chair, sort of half-sit on the back of it with my left foot on the seat, giving the knee position for the guitar.

Dave Oesterreich