Slatepack transaction method have been added to all MWC wallets while keeping backward compatibility with current File, HTTP, MQS and TOR transaction methods.
Slatepacks have many benefits over Http/MQS/File transfer methods: it’s easier to use as it’s a simple copy/paste of the Slatepack message, there’s no complex firewalls to setup, file handling or risks related to security and privacy.
Encoded Slatepacks provide higher security as it guarantee that only right address can read the message.