I don't know much about Emu campers, but can give you my thoughts on the disc over-ride. I've got them in our trailer, they work well but I you can feel it jolting back & forth when you hit bumps.
However, with electric brakes you need to install the controller in every car you tow it with. About $400-500 I think for a quality unit. We have two cars that was going to tow it. An extra grand on an entry level camper purchase price. That drove my decision to go with an o'ride disc system.
Saying that, our next trailer will have electric brakes. But that will be a more expensive purchase, so the controller won't be such a large portion of the price.
Anyway, that's my two cents.
Enjoy your trailer, whatever you choose & have fun with the mods. :-)
Cheers Dave.