In my opinion - you should find the exchange which is safe. That's main and the most important criterion to me. Before you register and input your personal data, I recommend you to take a look at the security practices. You can also check the opinions about exchange on the internet. But the safety is the most important! I use CoinDeal because of its security standards like  SSL, mandatory 2FA, email notifications (about login attempt from different IP than usual) or CloudFlare security. Funds are also stored in the cold wallets which is a great superiority.