Please decide what kind of control board will be used to control your robot car?
Arduino UNO Board
Best Affordability, Good for Beginner to Learn Robotics
Arduino MEGA2560 Board
Good for intermedia robotic projects which need more PWM pins, Interrupts pins and Timers, i.e Mecanum Wheel Cars.
Raspberry Pi Board
Most Powerful Computer Board which has real Linux OS. Good for Complicated Robotic project for computer vision, AI and cloud.