Put it this way, jewelers & pharmacists use digital scales these days almost exclusively. Both are probably less forgiving then your average reloader of inaccurate scales.
The electric scales are simply different, not better or worse as far as accuracy & repeatability are concerned. One must learn the quirks of one's own digital scale and then using it to reload is seamless. Others have mentioned the common issues- fresh batteries, consistent ambient temperature. Mine goes squirly if I'm hovering over it breathing on the tray, or if there's a fan on or some other air-current.