Its capabilty to build apps for different platforms from a single source code.

Since its a cross platform framework for app development. I Like its speed of performance for both Android apps and Ios apps. One of the best thing about flutter is that its growing community and the dart language with null safety. absolutely loved developing with flutter

There are so many things I love about flutter, like hot reload and hot restart features and almost all platform support. Another best thing about flutter is the best and most prominent community support as Flutter is an open-source SDK.