So maybe you are planning to buy hundreds or thousands worth of Bitcoin that's why you're looking for the safest wallet. There are lots actually, it's below...

KeepKey – Hardware Wallet
Nano Ledger S – Hardware Wallet
Trezor – Hardware Wallet
Coinbase – Hot Wallet
MyEtherWallet – Paper Wallet
Jaxx — Software Wallet
Electrum – Software Wallet

Why? It's here, https://blockgeeks.com/cryptocurrency-safe/