Meaningless question. Simetimes it's what you need. Sometimes it's not. Sometimes you want to write the arabic digit 3, sometimes you want to write the word thr

Meaningless question. Simetimes it's what you need. Sometimes it's not. Sometimes you want to write the arabic digit 3, sometimes you want to write the word three. What is the advantage of writing out three? The advantage is whatever the advantage is in those situations when you want it. The possible details are infinite.