Electric brake controllers

Hi all,

I have been searching threads to gather info on electric brake controllers.
I narrowed it down to either the Tekonsha P3 or the prodigy.

I then went to visit the auto sparky, who told me he has had trouble with trailers and bad earthing giving them a problem.
He assured me the tekonshas were great, but if there was a bad earth or fault on the trailer it gives grief.
He recommended fitting a Hayman Reese Controller.
Now I'm totally confused.
I was led to believe that the Tekonshas were better because the pendulum gave better braking control when off road.
This would be an advantage somewhere like the high country.
Now the auto leccie is telling me the Hayman is less likely to give grief.

Hence my conundrum.........
What do most people recommend???
I'm guessing the best place to askwould be Derek at ABR.
I will email him on Monday, but am interested in what everyone has to say?

Thanks
Brian