A Level Best grading box will perform equally well with any major brand of technology. What system you choose comes down to personal preference: How accurate do you want to be? What is your budget? Is your dealer going to give you personalised service after the sale? Are you currently using a specific brand of technology and want to stick with it?
All the major brands of technology offer fully capable, robust systems that will keep you grading accurately for years to come. The biggest variable between a system that is running smoothly & making you money and one that is constant headaches seems to be the amount of training and support the dealer can supply.