Laptop for programming

Next year I'll hopefully be going to Uni to study Computer Science and I need a laptop that has a great battery life, because I'll be away for pretty much the whole day, but I also want a powerful laptop on which I could game casually and do machine learning. I tought of getting an alienware or a Dell xps 15, but I can't seem to be able to decide. via /r/tech https://ift.tt/2AMqC03