I ended up choosing Engel for the following reason.
My daughter sold both Engel & Waeco in the shop she worked at in Port Hedland for a couple of years, eight out of ten warranty jobs were Waeco and some were not repairable. She also said that Waeco could not cope with the humidity as well as Engel.
They have also criscrossed the country extensively and always take the most difficult route. They have two Engels and had to buy an ARB 12 months ago as they were not able to take the Engel on the plane. The ARB broke down and is in the process of being replaced under warranty, the ARB did hardly any work compared to the Engels which are still going strong. Engel cost me more than Waeco but I think it's a sound investment.
But like someone said earlier it's like Ford v Holden.