I have four different manufacturers drum style powder measures plus a Harrell Custom 90.
All of them work fine but I do fine they work better if I am not operating at the extremes of the metering cavity. Three of the four have two metering drums but I have multiple measures so that I do not have to swap out drums.
I have settled on a Redding 10-X for handgun, I even use it on my progressive presses.
I use the RCBS Uniflow for small rifle. Since I got the Harrell, the Uniflow only gets used on the progressive presses. With the large drum in the Uniflow, it works fine for larger rifle cartridges such as the 30-06, but I got a Midway Indispensable powder measure which works great with large rifle cartridges.
I have the Hornady L-N-L powder measure that came with the Hornady press. It works ok but I prefer the others. The Hornady is currently retired.
For single stage reloading, the Harrell is great. It is about all I use for single stage rifle cartridge loading.
I have a PACT auto powder dispenser but find it too slow for all loading except load development. Since I got the Harrell, I do not use the PACT much any more.
All of my drum measures have micrometer adjusters. The micrometer adjusters do not make the measures more accurate, but it makes returning to a particular charge very quick and it makes adjusting the charge very easy. Just remember to log the setting with your reloading data.
I used to use an RCBS Little Dandy powder measure for handgun. I still have the measure and all the rotors but I have not used it in decades. The measure works great but I got frustrated with the fixed cavity rotors and not being able to dial in my powder charge. Hence, I would not recommend dippers or other fixed cavity powder delivery systems.
Just my two cents worth.