There is no such thing as “the best bitcoin wallet.” But undoubtedly, hardware wallets are a great option. But if you don’t want a hardware wallet, you can consider paper wallets. In the paper wallet, you print out a sheet of paper with your private and public keys, which is stored in the form of QR code. Also, these wallets are not connected to the internet that protects it from hacker theft. 

Also, you can refer to this guide here “Choosing the right digital wallet to store your cryptocurrency.” It will surely help you.

https://www.altcoinsidekick.com/bitcoin-basic-blog/choosing-the-right-digital-wallet-to-store-your-cryptocurrency