I like Poloniex; haven't had any trouble with them that they have not fixed for me. I don't invest in sh*t coins anymore so I think I'm good to go. Also I would like to add; I took everyone's advice when I first got into cryptos and never left coins on the exchanges but for short term I think the exchanges are safer than messing around with core wallets and I had heart stopping experiences with a lot of those wallets that malfunctioned...