Here i will suggest wallet is more secure than exchanges,Exchanges are at risk of hackers and hackers became more expert than exchanges management.Secure funds in offline wallet it allow more security of funds also keep your keys with ypurself with backup and dont share to any one.
You can put money on the trading exchange to facilitate for transaction. If you have too much money, I advise you not to put too much on the floor because your account is hacked and you lost all your money.