Apples and oranges:)
The ready brake, when set up properly, will help to stop your vehicle, and keep you legal, since you are required to have an auxiliary brake system on your toad.
The $200 dollar system will require that you get some sort of brake system, which will raise the price substantially.
Depending on what you are towing, the cheap bar may be OK, but if you have a vehicle that you might miss, if it went flying off the side of the road, it is probably better to make the investment.
I'm pretty sure that ReadyBrake also makes a system that will attach to the cheaper tow bar, so you may save some money that way.
Good luck.