Agreed on both, NOS or Nitrous, both are used interchangeably. I cannot remember the last time I heard the term "nitrous oxide" used in its full vernacular other that maybe at the dentist. They all mean the same, at least in street circles they do.
Second, ALL make power, some in my opinion, based on MY experiance, do it better than others.
Wet nitrous is an easy approach, but as mentioned by many, maybe TOO easy. The "bolt and go" will not lead to long engine life. Built right, a turbo motor on nitrous can and will flat out make serious power.