Very big ears can be a disadvantage for elephants living in a dense forest because they can get caught in the foliage of the forest. Forest elephants have developed to be smaller then other African elephants and their ears are more rounded.
Indian elephants have smaller ears, and African elephants have larger ears. I also think that the African elephants tusks might be a bit larger than the Indian ones. This answer is not completely accurate, but the Indian elephants do have smaller ears than African.