Hands down "The Best" is a Gen 2 Prometheus, after that is a Chargemaster.
+1 on the Prometheus; however, like the Greek, I tend to believe it is a mythical creature. How could so many people lust after a machine, and yet they stop making them? For a year or two, I made do with a Chargemaster. It is good, but left me wanting. When I couldn't locate a Prometheus, I decided to settle for second best, a Sartorius GD503
Sartorius Magnetic Scale Is Fast, Precise within AccurateShooter.com and I haven't looked back. Combined with an Omega Trickler, I've got a birds nest on the ground. I now weigh my loads to a single kernal of Varget.
Only thing is that that article is a little old and expect to pay double IF you can find one. They stopped making them in May of '13. (I sort of get the idea of going out on top, but this is starting to become a nasty habit.) I bought mine here
https://www.scalesgalore.com/sartorius_GD503_NTEP.cfm and apparently they still have some in stock. Word of warning, If you purchase one, don't have an AMI (acute myocardial infarction, AKA, a heart attack) when you open it and find that it won't read in grains. There are a few articles on this forum that explain how to fix that situation.
Part of the reason this one is still in stock is probably because it is set up to be Legal-for-trade. 1) That means there is a seal on the bottom which you must break in order to switch it to read in grains, which also makes it NOT legal for trade, but you really don't care about that. 2) You won't find those directions anywhere but this site. 3) Even with the directions, it takes some looking, and a little skill to switch it. 4) Since the one they are selling is set up to be legal-for-trade, the instruction book is crippled. Again, Snipershide to the rescue. You will also find the complete instruction book (or a url) on this site which will allow you to reprogram it to read in grains.
All of this sounds complicated, and it can be, but it is worth it if you happen to be CDO like me, (That's like OCD, but the letters are in alphabetical order, like they SHOULD be!) In some ways it is better than a Prometheus (Sour grapes? What's that?). Seriously, the Prometheus is a uni-tasker. It does one thing exceedingly well, but only one thing, measure powder. I have used my GD503 to sort my bullets and brass to 0.01gn. It will measure to .005gn, but even I am not that CDO! I say I used to, because now I sort my bullets by bearing length (Ogive to boattail).