The reddit page has good summary on KuCoin

https://www.reddit.com/r/kucoin/comments/7dm6s5/new_to_kucoin_check_this_out_faq/

A lot of selling points . I like that they pay Gas dividends for Neo holders. I have invested in both kucoin and COBINHOOD.  With bitcoin getting lot of mainstream attention with news on BTC listing on Chicago Mercantile Exchange and NASDAQ, 2018 could be the year where lot of big money comes into cryptos.

While one can not be sure about the success of all altcoins, these exchanges are definitely safer bet with good potential. Fingers crossed !