I like Kraken....but perhaps not so good if you are rolling around in trades with 50 BTC or whatever.....
Bitstamp is the most established and most 'shenaningan free' of the large exchanges, but they only offer very limited trading tools...Buy, Sell, Stop, Market and Limit. No leverage. No shorting.
That leaves Bitfinex, Huobi, and OKcoin.......a man takes his chances in the Wild West.
I'm not to 50 BTC trades yet so I'm sure Kraken would be fine for now as long as i can use it from Florida. I'm just looking for a place to trade that won't require me to cash out to my bank account everytime I sell and then use my CC/Check card to buy again. I want to be able to have fast reaction times. Ideally, cash funds would be held on the site when I sell so I can instantly rebuy. I'm also concerned about generating a SAR with 20k in charges rolling in and out of my account. Low fees are a bonus. Thanks!