binance is the best one i have experienced so far....

low transaction fee
attractive competitions and giveaways
so many different altcoins for trading
has trading charts, trading history
-u can easily withdraw 2btc without even getting verified.
use my referral code to sign up, and tell me your bnb wallet address, i will give you a free bnb coin (worth USD$9) as a form of appreciation.
https://www.binance.com/?ref=15531011