Number 3 please, Thank you!
How secure are the ballet wallets? Can someone use it like hardware wallet?
Ballet wallets are BIP38 encrypted wallets and therefore not a hardware wallet.
Anytime I use a paper wallet I fully sweep and never use again as the private key has been exposed to the internet.
A hardware wallet I can use over and over again and like Trezor are BIP39 wallets, deterministic wallets so they are totally different.