in my experience with HitBTC, you can trade with them but transfer your coins in the form of doge, same with tradesat. once you got your coins, withdraw them as fast as you can. if you use the btc withdrawal in tradesat, i dont think it will ever come to your wallet in your expected time. i have had bad experience in withdrawing btc from them, took more than a week to credit in my acct. but if you convert your coin to doge, relatively fast.
never used p2pb2b because of so many scam accusations, so better stay away from them. while whitebit - never heard til now.
I have seen a number of Scam accusations for tradesatoshi and HitBTC too. It looks like they are the kind of exchanges that selectively scam people. I have been one of those lucky people who have used HitBTC without any issues but there are people who got ripped off by them. If you check out the reviews, you will realize that they just choose to block any account as they please and the issues are usually never fully resolved due to the shit support.
So personally, i wouldn't recommend anyone new to use those platforms because you never know what could happen next... Better to be safe than sorry.