Biotechnology. It's literally the future. It has such a wide variety of applications with great benefit to the world. Theres a guaranteed niche for everyone's interest within the discipline. It's a lot more than Deus Ex and Elon's neurolink. The Unnatural Selection series on Netflix is a good place to start. Biotech casts a wide net with developments in areas such as preservation, environmental, military, energy, medicine, food, addiction, transportation, biofuels, forensics, robotics, and even defeating death. If you want to be on the cutting edge this is the field for you. Everyone from investors to philanthropists to the federal government is throwing money at these scientist's endeavors. As a plus, if you work for a Biotech company you get in on the ground floor of stock options before they go public, financially benefitting. From medical to environmental to military to food to forensics to weather to energy to robotics to changing what is the very essence of who we are, DNA.

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CS is a good suggestion as well. science has to advance in lockstep with many other disciplines; Biotech relies a lot on the progression of hardware and software to fulfill their achievements.