Since the digital storage is prone to hacking and malware attacks, it might be risky to store your bitcoins in a digital wallet. So I’d suggest, the best way to store your bitcoins is the Paper Wallet which is the safest alternative as of now.
In simple terms, a paper wallet is just a physical and offline means of storing bitcoins. By making a paper wallet, you’re just printing your private keys and bitcoin addresses on a paper. Seeing it this way, a paper wallet is a document containing copies of your public and private keys, thereby making up a physical wallet. These paper wallets also have QR codes so that you can scan the QR code to feed the keys into a virtual wallet to make transactions on the go.
The greatest benefit of using paper wallets for cold storage is that you don’t need to store your keys in digital format. So there are no potential threats such as hacking or malware attacks.