The problem is after you graduate, you will only have 12 month opt which is less than 27 month opt in IT field. Its hard to find H1filing companies.. Before studying Masters , think about it what will you do after you graduate. I have seen students ending up doing a PHD after Masters just to stay in status.. .. think about it. America is very unwelcoming for international workers.Think about it

So, go for IT .. atleast if you get a job you can work for 27 months..