Sometimes it's the little things after the purchase that can make a difference. I use BLUE and have been very happy with no problems, and I bought it used. Not even a decapper pin has broke. A friend has a new RED, and while they support him well, he still has had problems and has to wait for parts to show up to fix what ever broke. Local stores don't handle much in the way of parts for either Blue or Red. My Green is a single stage press, and there's not much to go wrong but when and if I need something, say a primer decapping pin, I can go to at least 4 or 5 local stores, and chances are they'll have the part---no wait.
I've only watched my friend a short time with his red, but it seems that the left hand feeds cases and bullets, with the right hand on the lever. With my BLUE I use both hands-- the left hand for bullets and the right hand for cases, on opposite sides of the machine and it seems to work smoother, but that's just me.