The most beneficial aspect of digital calipers is differential measurements. There is no math, just span the part and hit zero, now and movement and subsequent reading will be relative from the zeroed part.
Keep spare batteries around because they will be dead when you need them the most. I have lots of different ones from very expensive to one plastic set of vernier calipers that cost $.99.
Vernier calipers are by far the most durable and are much less expensive than the others. They have one drawback in that unless you grew up using a slide rule, and even if you did your eyes are not as good now as they were then, so they are difficult to use. The only ones I use now are the really long ones just because a 48 inch dial caliper is quite expensive.
For reloading you don’t need to spend a lot of money a $10 set of HF calipers will do everything the B&S or Mitutoyo except make your wallet lighter.
I suggest everyone own a set of standards and you can check them all side by side if you want to.
One thing you need to make sure of with digital calipers is that the foam in the box doesn’t hit the on/off button when you close it.
If it does you will turn them off and then turn them right back on so the next time you come back to use it the battery is dead and you think the caliper eats batteries when it’s just been on for the last two weeks.