in principle, the digital one could maintain a slightly tighter temperature range -- at the radiator. But there wouldn't be much difference, practically speaking. Calibration might be a little different, too -- but you're going to set the thing at a comfortable temperature, so what the actual numbers say isn't important.
Digitals do look cool, though...
Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England.
Hoffman Equipped System (all original except boiler), Weil-McClain 580, 2.75 gph Carlin, Vapourstat 0.5 -- 6.0 ounces per square inch