Maybe you are planning to hold different altcoins for long term trading? I have altcoins and I keep it inside exchange and set it in my target price for selling but if you want wallet for your altcoins myetherwallet is the only wallet that I know to keep all your altcoins. If I were you, much better to keep it inside exchange ni hussle and anytime you can trade it just make sure that your account is secured protected with 2fa and regularly updating your password.