Pune vs Mumbai?

I live in Pune and have never lived in Mumbai. I have been to Mumbai at max twice with a total of maybe 20 hours spent there. How does it feel like to live in Mumbai? How exorbidant are house prices and rents? Ani mala Marathi bolnayachi saway ahe saglyanshi Punyat, Mumbai madhe kiti lok boltat Marathi? (How often do you use Marathi) Batao batao Mumbaikars.