Saw this on Reddit:
Gdafo
This is also referred to as srs by some sites albeit they don't do it for offense and defense. It takes a teams standard ga and gf and adjusts them for opponent difficulty(scoring 3 goals vs nj or dallas is a lot more impressive than 3 vs the penguins). You have gaafo(goals against adjusted for opponent) and gfafo(goals for adjusted for opponent).
Deviation
I've used this stat before. It basically compares basic stats for offensive or defensive production like shooting %, shots against, pk%, etc and relates them to league average for offense and defense.
xgf/ga adjusted
This is a slightly flawed stat, it uses moneypucks xgf/ga model and adjusts that for a teams pdo, aka shooting and save %. Obviously the issue is if a team takes more higher or low danger shots, that have a less or mote likely chance to go in, it should hurt or boost their xgf/ga.