As of 2015, I see that Android studio is an official IDE for developing android applications according to information on their official site and on each page of their site, there is a note suggesting to go for Android studio rather than Eclipse with ADT.
Note: If you have been using Eclipse with ADT, be aware that Android Studio is now the official IDE for Android, so you should migrate to Android Studio to receive all the latest IDE updates.
But I haven't found any latest article about the pros and cons in choosing the IDE or eclipse with ADT. If some one can throw some light on it then it would help other beginners like me in choosing the right app for android development
IMO everything you can do with Android Studio (gradle, maven, etc) you can do it with Eclipse faster and easier and i mean "faster, easier" because in Eclipse if any problems arises like "error XX" you do a quick search on yahoo/google/whatever and thousands of results appears of guys who had the same problem and how to fix it.
I've been programming with Eclipse for C/C++ and Java over 8 years already switching to IntelliJ for me is a total waste of time with translates in a huge loss of money, all my clients wants their apps for yesterday and i can't have the luxury of "playing" and wasting time tweaking a really different IDE while i have bills to pay. So in my case i will 100% stay with Eclipse.