Should I major in computer systems or AI?

Systems: "Systems is the study of the design and implementation of computer systems such as compilers, databases, networks, and operating systems. Topics include the hardware/software interface, the networking stack, digital architecture, memory models, optimization, concurrency, privacy, security, distributed and large-scale systems, reliability and fault tolerance, and related algorithms and theoretical topics."

or AI (machine learning).

Which is a more exciting field to go into given this day and age?