Already asked and answered a few posts above yours,
I posted this reply two months ago:
In practice they only differ in the version of the Silicon Labs EmberZNet SDK that the firmware image been build from.
There might also be some small configuration difference but both are built from the official SDK from Silicon Labs.
Sonoff has just not made any update images since initial release, however if they did it would basically be the same.
Recommendations varies depending on setup and devices used but in general with Zigbee the saying ”do not fix was isn’t broken” goes a long way.
So be sure to follow all the other best practice tips before update the firmware, see: