"...digital scales vs beam scales? Is one better than the other?"
Not really, they are just different and each has some (small) advantages or the other.
Beam scales are "better" for weighting powder charges while using a trickler. They follow the add powder accurately and immediately. Magnetically damped scales, as ALL modern ones are, don't swing much before they stop and, contrary to some beliefs, the magnets have NO impact on the scales accuracy or sensitivity. Beams shine when weighing a lot of things near the same weight, at least within +- .5 gr. Down side, to some extent, is that you must keep it dust and dirt free and be careful not to knock the beam weights out of position. And it's nice to have a scale up near eye level to make reading it easy, many try to use them on low bench tops and cuss the parallex effect, but that's their own fault!
Digital scales are better for weighting items with variations that exceed +- .5 gr., such as when seperating cases or cast bullets. They are easy to read no matter where they are placed. Down side is they tend to drift calibration with warm-up and must be zeroed often. They are susceptible to power line changes. The weight detector is somewhat delicate and can be damaged if objects are dropped on it. Digitals also have a slight time lag in the read-out si they often "jump" a few tenths of a gr. at a time when trickling charges.
Both types are very susceptible to air currents, all sensitive things are.
My position is, buy a beam scale for weighting powder and get a digital if you weight select a LOT of brass or cast bullets.
Digital powder dispensing systems are a whole different, and expensive, topic.