It is better to store BTC in an online wallet, such as COINBASE .
No, man. You make a wrong suggestion. Hardware wallets should be the first option to keep Bitcoin for a long time. Trezor Model T, Trezor One, Ledger Nano S, or Billfold Steel are good options for hardware wallets. Trust me, keeping your Bitcoin on hardware wallets must be more secure than storing your Bitcoin on an exchange.