I technically you can't join directly in the PUC science. Because at present Indian education system is running with old system new education system is not implemented now. So technically at present both are the different streams. If you want to study science so you have to start all over again. And also it's a loss of 2 years.

in my recommendation in commerce stream there is a lot of opportunities in future.

I think you have got your answer. Best of luck of your upcoming future.