The decision is completely on you to be honest. Since you like both, you should really sit down and do some research on both. Look at what both courses teach you and what your interests are.
You could either contribute to the making of video games, or you could serve against unethical hacking. Your choice.
Personally, I'd go with game development. Imagine working for a company like Ubisoft, and having the work that you made in the next Assassins Creed game. I don't know, but that would be a surreal feeling everytime.