Well idk about the other 2 but for DRG it's the skills at level 56 and 58 that are pretty much the same. Wheeling thrust and fang and claw. The only difference is the positionals. One is from behind and the other is from the flank. They are both 290 potency or if you miss the positional then 100 potency. And the worst part is they are random as to which one will proc after the 3rd skill in a combo under blood of the dragon. So you never know which one will be available so you never know where you will need to be positioned for the 4th skill in the combo. So if you miss it then it's only a 100 potency attack.