I started out with a Case 480LL with a Gannon box with scariffier teeth. What a piece of crap for my needs. If you want to a level a lot FAST......use a box blade on a CTL.
I have tried the skip loader route, (too big, bulky, and inprecise) a box blade on a skid steer, (not enough traction when the box was full of dirt) a grader blade on a CTL (too slow and no dirt moving capabilities) and a box blade on a CTL. I have tried them all and the most productive was the box blade on a CTL.
There is a local commercial concrete contractor that does big jobs like Walmarts and the like all over the western region and he has two SS with laser box blades for prepping his slabs.
2013 Cat 299D XHP
Bobcat Flail Cutter
84" Custom Built Scarifier
84" Custom Built Mini Dozer Blade/Grapple Bucket
84" Custom Built Ripper/Ring Roller
84" Level Best Dual Slope Box Grader with Power Masts