I'd like to know too which is the best exchange to trade with. I think being the first one adding BCC will make a big difference.
Expect the exchanges to release public presses regarding the possible fork, just like what happened during the whole ethereum/ethereum classic debacle. In the next few hours/days we'll know where each exchange stands and their plans for Aug 1st.
I'd recommend waiting a bit and not start trading right away on aug 1st as the swings will be huuuge