ZB.COM is a Hong Kong based exchange that ranks in the top 20 in terms of trading volume. It caters to the Chinese market and offers advanced trading features.
Trading Fee: 0.2%
Withdrawal Fee: 0.001 BTC
Number of Tokens/Coins: 79
ZB token holders receive discounts on trading fees.

Kraken is a US-based cryptocurrency exchange and one of the largest bitcoin exchanges in terms of volume and liquidity.
It provides Bitcoin pricing to the Bloomberg Terminal and has considerable influence on the overall crypto market. Kraken offers a number fiat funding and transfer options.
There are 18 BTC pairs and 16 USD pair to trade
Fees vary depending on the volume - for main trading pairs this is between 0.1-0.35% - however for other less common crypto pairs the range can be as low as 0.05% or as high as 0.75%. There are also 0% fees for some trades.
Withdrawals and deposits are variable depending on the method - although in general all fees are 0.19% with a $20 minimum.

OEX is a top 30 exchange with increasing trading volumes. The token selection is not large and includes some tokens that are not listed on many other exchanges.

Trading Fee: 0.2%
Withdrawal Fee: 0
Number of Tokens/Coins: 13