SSC or RACK? Both are good, although I haven't heard of RACK up until this thread. To me they are both simply ways of stating an idea rather than a rule to follow. If someone asks who doesn't know a whole lot I might say "Well, we practice Safe Sane and Consensual so this kink really isn't that bad." But between me and a submissive I trust my logic and reason and use that as a benchmark rather than some acronym. Questions would come up between us "is this something we want?" "Is it worth the risk" not “well is this SSC or RACK?”

So basically they are good ways to generalize the idea but in the end I think each of us are intelligent enough, or should be, to use reason as a benchmark.

So back to the original question, SSC or RACK? SSC only by virtue of the fact that it’s older.