Netty framework's event driven interface enables you to write complex, high throughput network applications conveniently. Event driven asynchronous interface enables you to create process bound non blocking network applications of high throughput. Also layered approach that you can adapt by following Netty framework design enables good level of maintainability in your code. Either you are writing a TCP/UDP or a websocket based application you will be following a similar design patterns which are backed by superb documentation. Neety's power really kicks in when you are writing a complex application that will evolve in the future. Maintenance become fairly easy compared to other networking frameworks.

it has lot of interfaces to adopt to the scenarios it provides non block way of processing message across client and server asynchronous event-driven network application framework API's are very flexible to handle error cases