docs(README): add mqtt broker link

README.md

@@ -10,7 +10,7 @@
 [![YouTube](https://img.shields.io/badge/Subscribe-EMQ-FF0000?logo=youtube)](https://www.youtube.com/channel/UC5FjR77ErAxvZENEWzQaO5Q)
 
 
-EMQX is the world's most scalable open-source MQTT broker with a high performance that connects 100M+ IoT devices in 1 cluster, while maintaining 1M message per second throughput and sub-millisecond latency.
+EMQX is the world's most scalable open-source [MQTT broker](https://www.emqx.com/en/blog/the-ultimate-guide-to-mqtt-broker-comparison) with a high performance that connects 100M+ IoT devices in 1 cluster, while maintaining 1M message per second throughput and sub-millisecond latency.
 
 EMQX supports multiple open standard protocols like MQTT, HTTP, QUIC, and WebSocket. It’s 100% compliant with MQTT 5.0 and 3.x standard, and secures bi-directional communication with MQTT over TLS/SSL and various authentication mechanisms.