The grading scraper is much better. Most people who advocate for the box blade have never tried a grading scraper. I have never heard of anyone who, after using both, preferred the box for grading. I have and use both. The box is better at moving quantities of soil (and shaping it if you have top-n-tilt), while the grader is better at grading. The box is more versatile overall. If you have a box, you can move soil and grade also. The grader does not move soil like the box. If you need to do both jobs and can only afford one implement, buy a box. If you only do grading, buy a grading scraper. If you have a box, need to grade, and have the money, buy a grader too.