I have no experience with the others, but I've been using a FA Intellidropper for several years and it is pretty much all I use. Once in a while, when I really don't care about exact drops, I'll switch to my manual Hornady powder dropper...but all rifle loads, and the overwhelming majority of pistol loads go to my Intellidropper. It is fast, it is repeatable, it is accurate and it puts powder in the pan, and nowhere else. The cat's meow is the Powder Calibration function, which I run prior to any work. Takes about 30 seconds, certainly under a minute, and determines the best discharge speed for the initial throw, followed by trickling up to the set charge. New charge of the same powder can be set anytime, and it operates in Manual or Auto (new charge thrown when empty pan is set back on the scale).
When new, it tended to get about 2-3% undercharge in small pistol loads, especially with Universal. Now, undercharges are rare. I've never recorded an overcharge.
Emptying the powder hopper truly sucks...but I'm living with it. I caught a sale, and got my Intellidropper for $171.96 delivered.