ROBB gets all the rippers ready for use with a single pull of a handle. Makes things easier and faster. Depending on how far your back window opens if you can do this from the tractor seat or not. Pulling the lever from the seat is the exact design and works well from an open station tractor. Again depends on how far your window opens if you can do that from your cab tractor. You could connect a rope to pull the lever if you can't reach the lever itself.
A std box blade has to have each individual ripper lowered manually. So you would have to stop the tractor, get off, adjust each ripper get back on the tractor.
You can do this in minutes, or in seconds with a ROBB. That by itself is why I prefer them so much over a std box blade. You can also get a box blade with hydraulic actuated rippers which will be heavier and operate even easier, but then you will need a 3rd rear remote of some type to operate those.
The rippers go about twice as deep (10") compared to a std box blade. (4-6"?)
The ROBB is heavier than a std box blade, but you can get a heavy duty box blade that would weigh as much or even more depending on what you were to purchase. This is a simple case of you get what you pay for when it comes to box blades, most implements really.