I use the rabbit ringer and I like it. There is some bruising, but not as much as the broomstick method. It's also faster and very humane. I might try the quick cut method next time to see if it reduces bruising/pooling. But it's still way better than a hammer or a knife (and i can't easily use a gun, and also that would seem like overkill to me, no pun intended.)
I use the hopper popper and noticed more times than not I still ended up using the broomstick. I use the broomstick now but still hanging them with the hanger that comes with the hopper popper.