I have a Lee Pro disk, the Lee Auto drum and the Hornady LNL powder measure (and the Lee Perfect Powder measure which I only use for rifle)
I really think the Lee Autodrum is a great value and would me my choice.
(while not perfect, powder hopper can be easily removed while open if your are used to the pro disk with screws and forget there are no screws hold the hopper on
)
I still use the Auto disk as some disks throw the charge I want (of course I already have it) and some I opened up a bit to get the charge I wanted. (.43 throws 4.7gr of HP38 and .46 throws 5, favorite charges for 45 ACP) and as mentioned it does not drift when using fixed disks.
The Hornady looks fancier but I don't think it is any more accurate than the Autodrum or Autodisk.
+ or - .1 with both Lee measures using BE86, Bullseye, CFE-P, HP38, Universal, WSF and others.
The LPD throws Promo + or -.2 and it is a large flake.
I did not care much for the adjustable charge bar for the Autodisk, worked ok for larger charges not as well for smaller ones. (9mm size)
I find the Lee Autodrum hard to beat for the money.
(using Lee powder thru dies for pistol)