The best WS gear is mostly the same across the board. STR and MND and the best pieces have both on it. DB does fine for being a what it is, but it wouldn't be a better alternative to DPS unless you have a Mythic.

Where DB excels is it's ability to open and close high level SCs. If you are in more intimate company and you realize that SCs even exist, it can be significantly better total output because Distortion is more useful than Gravitation as an opener. Having Fragmentation as a 2nd lvl 2 property is a very nice bonus. BUT unless you are fighting something with high defense or your partner's have very potent Gravitation(or Fusion), you are probably better off throwing Req and being done with it.

KOR on the other hand has LVL 3 Light SC property, which basically takes the guesswork out of the equation if you are paired with a WAR or MNK that has Ukko's or VS. You can also use Fusion properties to open for Resolution's Fragmentation.

If you only care about yourself, Req is all you will almost ever need. RDM does have party based alternatives, and they are not too shabby. Does Murgleis suck compared to SAM, DRG, WAR, or PET mythics? You bet, but most Mythics do. The only thing Murgleis does is allows RDM to participate in an actual zerg as an actual zerg-er. Without it, you don't have a chance, nor will you ever because you aren't designed to.