GLES2 is the active development branch of andengine
AndEngine is a game development engine for Android written in Java programming language by Nicolas Gramlich. The engine uses OpenGL ES technology to provide accelerated graphics output. It's possible to use Eclipse or Android Studio to ease development.
GLES2: 'GLES2' Active development. Support: [> 93% of all Android devices (Apr. 2012)
GLES1: 'master' Not in active development. Support: > 99.0% of all Android devices (Apr. 2012)