I have never had any problems with the QC of ontario products, its a lot less than people would have you believe. As for the knives, they are both a great choice, however a little different. The RAT 7 is a fair bit lighter, with its 3/16 thick blade and also due to the fact that it is about an inch sorter. The RD7 is a much sturdier knife having a 1/4 inch thick stock and a thicker grind. Both have micarta handles, which is a plus as they can be shaped to fit your hand and both have a similar fit and finish.
The Ontario will be a lighter and easier knife to carry around on the belt, it will be a better slicer and better with food prep, but will be no slouch on the harder tasks, such as chopping and splitting.
The Ranger will be a much heavier and stronger knife that will exel in chopping, splitting and prying, but as a result will not be a great slicer.
Both knives come with a similar nylon/kydex sheath with a gear pocket.
At the end of the day they are both graet knives to my mind and either choice will serve you well.
One further point to consider is the great customer service that you will recieve from Justin at ranger knives.