No, conductivity meters are more precise, but refracs will meet you half way in also being portable. If the instrument is well made, you calibrate properly, and you feel you are proficient in using it then both are acceptable
Even with my bad eyesight I can clearly see the lines in my refractometer. That's why it has the viewing adjustment built it. Together with ATC and fresh calibration fluid I completely trust my refractometer. Would I rather have a calibrated electrical instrument? In most case yes. It's a cost/benefit thing.