I'm happy with a Lyman digital and a Wheeler analog. Both work fine.

Most important thing to consider - mount the gun rigid and use a lever to pull the gauge. Dead ending hard against the trigger stop will give artificially high readings. For some of the digitals, if you stop increasing pressure mid stroke, for example, in the middle of a DA revolver or pistol stroke, it'll stall at that number and won't register the true maximum weight. More about holding your tongue just right than the tools themselves.