Karbonn A18 and the Micromax Elite A84 have dual cameras. The Karbonn A18 has a 5 megapixel rear camera with auto focus, burst mode and face detection features. There is a front 1.3 megapixel front camera as well. Besides, the phone also boasts LED flash too.
On the other hand, according to Micromax, the Elite A84 has a 5 megapixel rear camera with LED flash. In the front lies a 0.3 megapixel camera. However, Micromax has not revealed that whether it has auto focus and all other features. So going specification on paper, Karbonn A18 seems to be a better choice.