If you wish to hold some coin then use exchange only for during exchange. Just exchange your coin and transfer on your personal wallet that you have controlled. Specially you can use hardware wallet.
Because many exchange hacked buy hacker. Many people loss their capital by hack.
So please don't hold your coin on exchange for long time.
It seems wise because I have heard few times about the attack on the exchange wallets and even about the hack on some of those. So I usually just withdraw all of my tokens from the exchange right after I have done the mandatory things with them.