They are free to play and offer similar cars and experience and both use the Unity 3D engine. So which one is better and which one should you get? I played both and here are my thoughts.
Kings of Parking starts by giving you a bus. It has two modes of camera, but both of them can make it hard to see where you are sometimes. The controls here are a tad easier because you have a "reverse gas" pedal instead of a gear stick. In most of the levels you have a couple of checkpoints to reach before you can park your vehicle. The game is lenient to scratches here and there and you should have no problems reaching your destination in one piece. After the bus you get to drive a limo and a sports car. There's also a bonus car - an Android truck. That one feels most like an arcade car and is quite fun to drive around.