I haven't tried the drill attachment or drum plucker (due to lack of funds). Hand plucking isn't too bad, and is pretty fast if you get the scalding correct. Takes maybe 10 minutes? Of course the drum or drill would be done in a minute or two. Unless you're doing large amounts of birds, hand plucking isn't too bad for CX, at least it was fine for me. I did 20 by myself just recently.
The time saver for me was going from plucking to skinning. The time to heat the water up for scalding, and then to pluck on top of that is what slowed me down. I could save half an hour processing time by skinning instead of scalding and plucking. For the birds I was parting out anyway, and wanted boneless skinless breasts, it made sense to skin them.
Also, for scalded vs skinned birds, the skinned ones had less smell - the wet feather smell didn't get all over me when processing like when I scalded them. The scalding water would get dirty and then the steam would get all up in my clothes and stuff and in my nose. For the skinning, even when I washed the carcass well with cold water and dish soap prior to skinning (they were not good at keeping their rears clean no matter what I did), the smell didn't get up in my sinuses and refuse to go away like when scalding. So that's something to consider.
Definitely have a good plan to deal with splatter prior to use, and how to sanitize and clean your equipment and work surfaces prior and during use, and whatever you're standing on. I ended up standing on a large area covered in mulch, and seeded it with compost starter once I was done. A few good rains, a bit more mulch, and the smell is pretty much gone, but some small bits are probably still composting.
With hand plucking I could pretty much put all the feathers in the 5 gallon bucket as soon as I pulled them off, and the mess stayed contained pretty well. With skinning, there was almost no feather mess at all because they all stayed on the skin, which came off as pretty much one large piece. When you use a drill plucker, you'll need a good plan for feather cleanup.
Good luck figuring out what works for you.