Rare is the builder who doesn't use a dishing tool and they are likely to own more than one. While no one requires several dish tools, builders tend to accumulate them—and spoke wrenches. Both tools reflect a builder's personal preferences. While one brand may outnumber another, there is no such thing as "the best." Bottom line, all dishing tools do the job—they establish whether a wheel is centered, that its rim runs midway between the axle ends.
The venerable German bike tool company, Cyclus, has been making professional bicycle tools for many decades and their dishing tool is a tradition of its own. Why should you consider a Cyclus dishing tool?