I have been using a Uniflow for literally 50 years and just last month finally changed the metering parts due to wear. Never tried a Harrell.
I charge my cases on-press using a Redding T-7 via a powder-through expanding die (handgun rounds only though 5.56 is in my future). After my learning curve, my Lyman 55 powder measure is reliable and consistent. I picked up an extra turret head and tried a second powder measure - tried the Lee Deluxe Perfect Measure - ugh. Leaking like a sieve with W296, get that fixed with some polishing compound, then play around with the angles for the throw arm and the .... call it the measuring tube. Long story made medium, I'm returning it in better condition than when it came to me, but I'm not going to mess around with it any more.
Internet sleuthing shows the Lyman 55 is discontinued.
What's the go-to value powder measure these days?