Building Your Own CNC Machine

Hello everyone,
I've got a little problem. I want to build my own CNC machine. When choosing the parts, a friend suggested I buy a CNC stepper motor kit. I was a little hesitant. There are two options: https://www.oyostepper.com/goods-898-3-Axis-CNC-Router-Kit-30Nm-425ozin-Nema-23-Stepper-Motor-Driver.html and https://www.oyostepper.com/goods-480-4-Axis-CNC-Router-Kit-30Nm-425ozin-Nema-23-Stepper-Motor-Driver.html
Which one is better?