Hardware wallet is the safest and best way to store any cryptocurrency. Some of the best bitcoin cash hardware wallets are - Ledger Nano S, Trezor, Coinomi, and KeepKey.

There are other types of wallets for storing BCH like mobile wallets, desktop wallets, web-based wallets, and paper wallets. Check the latest bitcoin cash wallets comparison and choose the best BCH wallet.
https://coinswitch.co/news/best-bitcoin-cash-wallets-2019