I would go with kraken. Make sure to trade from or to bitcoin and then withdraw your funds if you are not too sure about them.
But ask any experienced users and they will vouch for kraken.
That's some good advice bro.
I have been using kraken for a year now. Never had any problems, nor any downtime.
There was a little attack a few weeks ago (DDOS), but we can't blame them for this.