There are even significant differences between models within a brand.
Many of the controllers require you to level the unit in the car for the decelerometer to work properly, in a long wheel travel vehicle like a Range Rover or Defender the rock and rolling of the body can give false braking on cheaper controllers.
The most recommended controllers on this forum are Tekonsha. With model P3 for under dash mounting or Prodigy2 for on the transission tunnel or top of dash. I Have both - the Prodigy in my RRc and the P3 on the D4. These controllers use aviation technology for the decelerometer so do not need to be leveled in the vehicle and with an additional kit hard wired into each car the unit can be swapped between vehicles.
Some people use Redarc because the unit is hidden with only a knob protruding through the dash. I know nothing more about Redarc.
Hope this helps.
Diana
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