I don't think there is a safest for both of them because you are still susceptible to online attacks if you use this on an online device. Similar to copying and pasting a B99 address and sending it to the incorrect address, some people scan the QR code and send a B99 to the incorrect address. You can only be safe if you have a separate watch-only wallet online and a cold storage wallet on separate devices. As previously mentioned, if you know how to double-check the transaction when importing it to your Electrum offline wallet before signing it, using Electrum to scan a QR code or copying and pasting the raw hash are both safe. The crucial step is to confirm the transaction in an offline Electrum; it should display a preview of the transaction with your address and the recipient's address. If you don't check this part, there's a chance you could send your B99 to the wrong address even if it is safe on an offline device. So always double-check before signing a transaction.
I don't think there is a safest for both of them because you are still susceptible to online attacks if you use this on an online device. Similar to copying and pasting a B99 address and sending it to the incorrect address, some people scan the QR code and send a B99 to the incorrect address. You can only be safe if you have a separate watch-only wallet online and a cold storage wallet on separate devices. As previously mentioned, if you know how to double-check the transaction when importing it to your Electrum offline wallet before signing it, using Electrum to scan a QR code or copying and pasting the raw hash are both safe. The crucial step is to confirm the transaction in an offline Electrum; it should display a preview of the transaction with your address and the recipient's address. If you don't check this part, there's a chance you could send your B99 to the wrong address even if it is safe on an offline device. So always double-check before signing a transaction.

I don't think there is a safest for both of them because you are still susceptible to online attacks if you use this on an online device. Similar to copying and pasting a B99 address and sending it to the incorrect address, some people scan the QR code and send a B99 to the incorrect address. You can only be safe if you have a separate watch-only wallet online and a cold storage wallet on separate devices. As previously mentioned, if you know how to double-check the transaction when importing it to your Electrum offline wallet before signing it, using Electrum to scan a QR code or copying and pasting the raw hash are both safe. The crucial step is to confirm the transaction in an offline Electrum; it should display a preview of the transaction with your address and the recipient's address. If you don't check this part, there's a chance you could send your B99 to the wrong address even if it is safe on an offline device. So always double-check before signing a transaction.

I don't think there is a safest for both of them because you are still susceptible to online attacks if you use this on an online device. Similar to copying and pasting a B99 address and sending it to the incorrect address, some people scan the QR code and send a B99 to the incorrect address. You can only be safe if you have a separate watch-only wallet online and a cold storage wallet on separate devices. As previously mentioned, if you know how to double-check the transaction when importing it to your Electrum offline wallet before signing it, using Electrum to scan a QR code or copying and pasting the raw hash are both safe. The crucial step is to confirm the transaction in an offline Electrum; it should display a preview of the transaction with your address and the recipient's address. If you don't check this part, there's a chance you could send your B99 to the wrong address even if it is safe on an offline device. So always double-check before signing a transaction.