Why not both? Machine learning methods, while formalized in the 1950s, have only recently become powerful enough to make a huge impact. These deep learning methods have performed better at early cancer detection than professional radiologists! From image detection and Snapchat filters to Natural Language Processing and Siri, machine learning is ready to push our technology into the future.
Start with Python, TensorFlow, and a lot of data to build neural networks and reward your computer for succeeding at its goals! Tweak your reward schemes and process your data so you can see your computer improve its learning. Then, put your skills to the test in environments used by professional researchers like Deepmind's Starcraft 2 Learning Environment.