Digital scales are so much easier and faster to use that a balance scale. If you are using a powder drop and a powder that meters easily you can use the balance scale and be ok. If you have to measure out individually, go with the digital scale. A good one is usually very accurate, and can be calibrated, so that won't be a problem. When I first started reloading I used a balance scale, the next day I ordered a digital. A balance scale is a great back-up.