I don't think you can just compare the damage done by both abilities, because there's the opportunity cost of using Shockwave as a filler. DPE (damage per Execute) for DR is a lot higher than SW and for this ability to been competitive you have to use it roughly every 20 sec. In my personal experience, we don't have that many empty GCDs, but that could be because I'm using Storm Bolt usually.
I can see SW being more competitive with bad gear, like raid entry lvl.
Also sorry for bringing this stuff up in your guide thread, not sure if it's the ideal place to be arguing over things like these.
All right thanks for clarifying. I'm not sure how legit it is to ignore crit chance for SW and BS and then account for DR's garanteed crit, this will definetly skew results and the higher your crit chance the less value DR's garanteed crit has (similar to how Overpower can be over 100% crit chance with base crit + trinkets or during recklessness).