In the market there are several types of nunchakus, some are long, other shorts, etc. This post classify the size of the nunchaku. So, with this you will know how is your nunchaku, and you will be able to test different types of sizes, weights, etc.
The term “normal” is what most nunchakus have. IT IS NOT A RULE TO HAVE THE “NORMAL” SIZE
Which size is better? That can only be answer once you have test many of them… this is when you find the one that fit you best.