KuCoin is a crytpo-to-crypto exchange that offers traders a reward system through its KuCoin Shares token. Kucoin has a wide variety of cryptocurrencies listed and has a reputation as an early adopter of many tokens. This provides good opportunities for investing in coins and tokens that re relatively new to crypto markets.
KuCoins's native cryptocurrency, KuCoin Shares (KCS), gives holders up to a 30% discount on trading fees, and entitles holders to receive dividends from all trading fees that are collected on the exchange. KuCoin distributes 50% of all trading fee revenues from the platform.

Withdrawal Fee: 0.0005 BTC and 0.01 ETH
Trading Fee: 0.1%
Number of Markets: 377

Bittrex is one of the largest crypto to crypto exchanges. It offers a large number of trading pairs, but do not allow fiat to crypto trading. Bittrex has one of the largest trading volumes in the market.
It is a reputable exchange with good record on security and is also fully regulated. They provide two factor authentication as well as a number of other options to secure funds. They are United States based and are fully compliant with all laws.
They support more than 190 cryptocurrencies and have a dynamic platform. It’s a good option for both advanced and beginner traders; providing advanced tools like candlestick charts and crosshairs, but with a user-friendly interface that is very intuitive.
Trading Fees: 0.25%

OKEx is a relatively new exchange that allows cryptocurrency investors to trade a wide variety of fiat and crytpo pairs. Although it is based in China, and caters to the Chinese market, it has a platform that is easy to use in all languages, and has quickly become one of the largest exchanges, by volume, in the world. The highly secure platform provides high liquidity, and has a number of other advantages.
OKEx has a user friendly interface that can be understood by all traders, regardless of their experience. Their platform is a good option for new crypto users because it supports trading of one of the widest varieties of different cryptocurrencies. It is also a good option for professional investors and day traders. They offer high trading limits, future contracts, and a number of other trading tools, including a block explorer.
Withdrawal Fee: 0.1% with a minimum of $15
Trading Fee: 0.2%