Really depends on what your goal is I feel. Lots of people come here for the better pay but honestly they end up spending also a lot cuz everything is so damn expensive. The opportunities in Mumbai are something else. Whether it's to get work or start your own business there's no shortage of connections and jobs. I feel Delhi has superior infrastructure but the prople there are (to put it nicely) not so friendly. I've always found Mumbai to have far better behaved people. But if I wanted to chill I would prefer Goa, Cochin or Jaipur as well. Less opportunities in these places but.