About the fork will be credited the coins or not? If Yes then where better to keep Verge on the wallet or on the exchange?
Wallet is smarter.
1) Backup your wallet.dat files (depends on wallet type maybe)
2) wait for update files. Dl them, update wallet.
3) Copy your wallet.dat file back into wallet directory.
thats the QT wallets. I forget if the other wallet types use same thing, or just seeds.
Exchange... depends on THEM. if they upgrade, all is good. if they dont. u lost all your coins.