I worked in mobilepundits
as a Android developer and according to me Android studio provide best Android development environment and improvements over eclipse ADT. It offers me to use variety of functions such as
Flexible Gradle-based build system.
Build variants and multiple APK generation.
Expanded template support for Google Services and various device types.
Rich layout editor with support for theme editing.
Lint tools to catch performance, usability, version compatibility, and other problems.
ProGuard and app-signing capabilities.