For example, do you use '5' or '五' more often?
I think 5 is more ofen used in China.
as for me,5 is more often used.＾＾Actually except set phrases like ＂一石二鸟＂（kill two birds with one stone）,you can just use ＂5＂ to express the numer,figrue,time,age,etc.
Xiexie nimen responses!
Guoridong, what is "用于金钱数目方面的"? I have never heard of it, please elaborate a little more! :)
in most cases, alphabet numbers.
only when the number is inside a word, like "一心一意", you must use Chinese numbers.
“5” 在中国有两种写法 1.“五” 是用于书写方面的 2.“伍”是用于金钱数目方面的。