In terms of Pediatric Levels of Consciousness Scale vs Rancho Levels of Cognitive Functioning (make sure you know the difference between adult and pediatric scoring), I think Pediatric LOC is used to determine overall level of consciousness/alertness, whereas you can use RLAS to assess cognition and recovery patterns. It is helpful for rehab planning because it can track progression overtime, guide therapy goals, and predict functional outcomes.
GCS = how sick are they right now
Pediatric LOC = what is their level of alertness right now
RLAS = how is their brain recovering, what is their rehab potential
For generation PT use/value, I think we would use RLAS most often.