If at the time of the hard fork november 15 you will in bitcoins, then be sure to keep them on exchanges, otherwise you will not be able to make deposits for sale, both sides do not want to put protection from repeated transactions
It is much more safer to keep it in your own private keys and not with the exchanges. The exchanges can just decide not to give out the chain split coins and just keep them for themselves. Unlike if you keep it with your own keys then in case their is a chain split then you can always claim both coins. Unless there is already an announcement from your exchange that they will give out coins in case of chain split then go with them if you trust them enough.