I can't say much about Hyderabad, but living in Bangalore when someone says Bangalore is developed, it makes me laugh.
Other than having IT companies, what exactly is developed in Bangalore? 30mins of rain is enough to flood the ORR and bellandur. A decent apartment in Sarjapur costs minimum 2Cr, but the roads and drainage will make anyone tear their hair out. The road from Sony signal gets flooded after every rain, where literally billionaires live. I probably have a different criteria for the term 'developed' city.
TN, even though not helped by the centre is doing pretty well in terms of industries.