Which Pi to choose?

All sections of this book are compatible will all current versions of Raspberry Pi, but Model 3B is recommended as the best model to start with. This offers the best performance (particularly useful for the GPU examples in OpenCV examples used in Chapter 5, Detecting Edges and Contours in Images), lots of connections, and built-in Wi-Fi, which can be very convenient.

Pi Zero is recommended for projects where you want low power usage or reduced weight/size but do not need the full processing power of Model 3B. However, due to its ultra-low cost, Pi Zero is ideal for deploying a completed project after you have developed it.