Well, first of all, what is this "my hands" choice in the poll? Do moon clips, speed loaders, and speed strips work on auto-pilot, or do folks use their mouth and feet to hold these devices? Assuming "hands" means loading round by hand, well, if you are using a 2x2x2 carrier, that can be quite quick, but if it means fishing loose rounds from a pocket, that may the worst possible choice.
I have found speed strips are NOT fast for a complete reload, but they may the the fastest way to load two rounds, and those two rounds, fast, may save one's life.
I favor HKS speedloaders, for long-term sturdiness, and because they DO let the rounds jiggle just a bit.
At the height of my duty sixgun days, I had two HKS speedloaders on one side on the front of the duty belt, a 2x2x2 carrier on the other side, on the front, and a speed strip or two in the uniform shirt pockets. The HKS speedloaders were the fastest way to a complete reload, but the other systems had their strengths, too, so I can't say any one system/method was BEST.
Safariland speedloaders are too delicate, in my opinion, for long-term hard use. The softer plastic abrades badly, and if a fat fellow cop steps on them, on pavement, they REALLY abrade badly. I used them when I carried an M58, but when I switched to a GP100, and later K-frames, I went with HKS.