Dclaws in my opinion are bad including gmaul but if I had to choose one I would choose the claws as they are far more accurate. If you wanted to go pking I would reccomend dragon daggers or (non-corrupt 78att) vesta long sword for a spec weopan.
gmaul does a lot of damage in a very short time while dclaws does a lot more damage in a slightly longer amount of time. if your opponent is lower health then i would suggest claws but if your trying to spec out 30% hp i'd go with maul