I would probbably use sais because they are a very good defencive weapon, you could kill or hurt enemy if u want to ( use the sharp poinnt or the handle) and they are small and not very easy to spot if holding in a blocking position.
Right now im buying new sais and dont know which ones to buy. I have my eye on the black century sais on https://www.karatedepot.com. if you have any suggestions please tell