I started another thread on this a bit ago. I'm too lazy to go find the link right now, but I prefer R.A.C.K. myself. To me it represents our lifestyle better because it puts the responsibility on the indivuduals practicing bdsm instead of pretending that everything we do is "safe". I'm careful when I dom, but I'm also only human and can make a mistake as easily as the next guy. Luckily so far I've never made a big one, but it could happen and R.A.C.K. lets everybody know there is a risk involved in playing our way.