I am a trade and not a holder, so I am inclined to choose a reputable exchange for shelter. Binance and cryptopia they all have problems with hackers, but see cryptopia closed, user money is gone. But binance still works normally
Someone mentioned Binance might be pumping their IEOs recently lol. I like trading on Poloniex as it's my first bet as it hasn't had a giant breach and it's kind of like home- first trading platform i've used.