Both B.tech (CS) and BCA courses are best. But I think B.tech is more better than BCA because it is an engineering course. As you are interested in computer Gaming and software programming its better for you to pursue B.Tech course. If you wish to become a software engineer B.tech is best for you. But you have to appear for the entrance test because admission to the B.E/ B.Tech courses is generally made on the basis of the marks obtained in +2 and the merit in Common Entrance Test (CET), conducted by the competent authority.
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By studying BCA course you can work as programmers, web developers and e-commerce specialists in variety of environments in university, research, private and public industries, government departments, business organizations and commercial organizations.