It's a personal thing. You should be wary of phishing sites to avoid giving out your infos. Also, a very well-known exchange sites would be ideal if you want to assure your security as those sites have many people backing it and supporting it for its good and reliable system. Always remember to check the URL carefully before logging in your wallets because it is always the case of lost coin problems. ( They always got scammed or got hacked through phishing sites.)