Well it would be pretty difficult to argue that the RO box blades are better, seeing as they have all but been replaced by any and all professionals. If the RO boxes were the best thing going, all the pros would have them and the major implement manufacturers would not have discontinued them. They were not discontinued because they cost more than the current industrial models. So I have to say that the industrial boxes with the floating rear blade and the hydraulic scarifiers are better than the roll overs.
Now with that said, I prefer my Gannon roll over vs ANY std type of box blade. Imangine using a RO vs a std BB with no hydraulic top link or side link or scarifiers. RO easiely wins out in that senario in my eyes. But that may just be me. Different people like different things, I like to be able to rip down 10". You won't be doing that with a std BB. I like to be able to push a cubic yard of dirt in reverse. You will not do that with ANY std BB, industrial or not. A person that has not ever used a RO box blade probably doesn't realize that it takes only a few seconds to roll the box to where you want it. It's not like you have to stop the tractor and get off and set the teeth to the height that you may need or adjust the top link so that you can smooth out the surface that you are working on. They were state of the art in their day and really have only been replaced as top dog by the industrial box blades of today.
Just my :2cents: based on MY experience, others views will vary.