I liked the Prodigy and here's why:
Many brake controllers are "blind" - they often can't distinguish between the tow vehicle lightly applying the brakes vs hammering hard for a panic stop. A good brake controller can tell the difference. That is called "proportional braking". You can still adjust the "starting point" on both types, but the unit without proportional braking assumes that it must be a need to ramp up the braking intensity if you ride the brakes for 5 seconds, and will apply full brakes on the trailer, resulting in skidding.
At the same time, if you are cornering and need to brake hard, the system without proportional braking might not stay behind you, and fishtail out.
The prodigy can tell the difference between you applying your brakes lightly, or hard.
It is also solid state/electronic. Most units are, but you'll see some older versions of various brands that have more moving parts, and more room for error, in my experience.
Prodigy is self-diagnosing, as are a few other models. That means you get a code to indicate the nature of the problem, should one develop. If the problem is a bad ground, low voltage on the tow vehicle battery, or one of many other issues, you get a specific error code to speed up the diagnostics. This means quick repairs if you can do it yourself, or cheaper repairs if you need to go to a shop for help.
The better brake controllers reduce your cost in the long run, since your brakes and tires will last longer - less chance of skidding, swaying, etc.