Which Electric Brake Controller?

Definitely Pendulum. The electric ones are usually only on or off whereas the pendulum ones give a graduated braking effect depending on the baking severity of the tow vehicle.
I have a pendulum unit fitted for my Hawk Jaco, which pulls up a ton and a half. If you travel off road the adjustable braking is needed to stop the trailer wheels locking up all the time. The pendulum must be set up properly but this is easy and the braking can be varied by the slide on the front of the unit.
Saying this Redark does have a variable electronic unit but I have not seen this in action. Have a look at their site below under tech tips.
I think they only give an adjustable brake force, which you need to adjust.

http://www.redarc.com.au/aboutus.htm
Perhaps somebody else has had experience with this type.

Absolutely Pendulum- have had both and there is NO comparison!!
I have a Tekonsha and can't fault it!
Don't know re distributors as I live in Brisbane..

Yep agree, go the Tekonsha - they are fantastic & fully adjustable to suit the conditions.

toshenka the way to go fitted them for years while doing tow bars not sure where you are but hayman reece distribute them in victoria well they did about 10 yrs ago been that long since ive done themlooking foward to easter at jamieson