I have two sonoff rf bridges (one in the back of my house, in the front, because the reach of the door sensor on my garage door is not enough) When the second arrived, I compared both tasmota and openmqttgateway. OpenMqttGateway is a little bit faster according to the logs.
Second, if you have lot of automations based on the rf bridge, you might check this topic:
https://community.home-assistant.io/t/sonoff-rf-bridge-strategies-for-receiving-data/108181
Strategy two is faster, even if it adds an extra mqtt call.