sampathpj,
More than the "brand" what is important is the type/standard (Dexron II, Dexron III, Mercon, SP II, SP III etc etc). If you get a good "brand" but the wrong type/standard your auto tranny would be talking to you sooner than later!!! Check what type/standard your car takes, it's usually given on the auto-oil dipstick. When that is sorted check if the "brand" that you select confirms to the type/standard which your car takes.
PS
I am of course not an "expert".