If you are a trader you can put your tokens in the exchange site because this is the easiest way so that you can trade directly,but you need to be careful and be vigilant always if you place your tokens in the exchanger because it is very risky and i heard how many times in the news that the exchangers is hack,and the most advisable and safe way if you want to hold it for a long-term is to put your tokens in your personal wallet.