A rumor says hitbtc may be broke, so I avoid this website, but the liqui was just hacked by hackers and it is dangerous too, so I think you should choose by yourself, I prefer liqui.
Hitbtc is a scam exchange that is stealing deposits. Bittrex is doing the same. I trade only on Binance, because it is most secure and reliable exchange now days.
Bittrex stole deposits? I don't think so, I have used bittrex for 3 years, and it is reliable, withdrawal is instant. Binance sometimes auto-sell people's tokens, who knows? I like polo, binance and bittrex. I hope stox will be listing there.
Bittrex have some new rules and this rules dont looks good, but its really big exchange and will be reaaly good if they will add Stox in the next year. Binance looks good now too.