Shami, take it from an old fart who spent most of his life following his passion and that for me was Mechanical Engineering. I never once saw it as a job, so rather than waste time trying to pick things on the basis of money etc, do something that you are passionate about. The money will come and the work will not seem like work. Hell, half the jobs I have done I would have done for free, I loved the projects so much. Have never heard someone say "I can't believe they pay me to do this."
If you go for the money instead of the love, please come back in a few years time and tell us all how happy you are.