Both the beam and digital scale I've owned have been accurate. For speed I would go with the digital. There have been times it would need recalibration during use that had me wondering about the previous charges. The balance scale was slower but gave me plenty of confidence.
I use them both, but if I only had only one type to choose from for reloading it would be the balance beam scale, because I know it to be less problematic (most reliable) then the electric scales.
I make jacketed match swagged bullets and use the electric scale for speed.
Both types have their place on my bench and that is why I own and use them both.
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