Mechanical dampening is usually what sets the good ones apart. Most of the cheaper electronic ones, and the Lyman and RCBS fall into this category, wander all over the show. They are no better, or faster for that matter, than a decent set of beam scales.
In saying all of that, how accurate do you have to be? I know of plenty of guys using a dirty old charge master that can shoot groups in the .1's at a hundy. I like using nice shit though so I needed a GD503. YMMV.
As for balance beam scales, I'm not the one to ask cause I know fuck all about them.
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