I like Delhi but I don't love it anymore for the reasons you just mentioned above. I don't see it a place to live anymore. There is traffic and chaos and pollution and dirt. There are far better citites to live a nice, peaceful and trendy life in India.
haven't been to Chennai ever, so don't have much to say. But have been to some of the South India states like Bangalore and Hyderabad and I found them really nice,