Oh, I guess the bar stuff. Vine charcoal is good for super quick sketches but you cannot get dark out of it. However, you can get some nice, light and flowing lines. Try them both.
Brings back memories of artschool. We did many hundreds of quick sketches of a nude model with vine charcoal, ripped it off the pad and on to the next one., two or three minutes each. You didn't have time to think or worry, just draw. I miss that. Too much thinking in what I am doing now. Too slow and carefull. But satisfying in another way, when I really looks like what I am drawing.
Sorry, I digress.