I want to buy a Raspberry Pi, but I don't know which one. I want to start with machine learning and artificial intelligence. I thought the Raspberry Pi 2 b+ was enough, but with the 3 and the Zero now I'm so confused.
Get the RPi3, considering it to be the same price it's the better deal. There is also a port of Google's TensorFlow which allows it to run on the 3's new A53 based core. Good Luck!