We have a waeco that has been running almost non-stop for the last three years, it has survived corrugations in central australia and the cape as well as numerous trips to the beach. Couldn't be happier with it. Our neighbours have a ARB, it is also well travelled and has not had any problems.
As Steve has said its probably almost down to which one is the cheapest on the day and whether you want one that has a side opening lid (which can be swapped from one side to the other), or one that has lid that opens from the end.