One thing about ONT airdrop. I found article on binance that they support ONT airdrop. Do you think it's good idea to keep NEO there?
The best idea is as always: keep your coins/tokens in a wallet where you hold the private key from, the most secure way is to keep them on a hardware wallet like Ledger Nano S, the NEON wallet works great with the Ledger!
Only keep your coins on an exchange when you are currently trading.