Brevity pays in debate.

Conciseness : the extent to which a piece of writing communicates clear information in as few words as possible.
Sharpness : the quality or state of being sharp.
Quickness : the quality of moving fast or doing something in a short time.
Confidence : the feeling or belief that one can have faith in or rely on someone or something.
Brevity : concise and exact use of words in writing or speech.

Synonym of Brevity is Conciseness