Fan from VT is correct however, other studies have shown that scoring margin is a better predictor than won loss record.
I believe efficiency differential is slightly better than scoring margin as well.
I would expect that, especially as the season progresses, scoring margins and records vs good teams generally converge. And I don't think there's much of a difference between efficiency differential and scoring margin other than pace adjustment.
Of course there isn't much difference between scoring margin and efficiency other than pace, that is by definition the difference.
The pace correct makes it noticeably more accurate, especially when you're dealing with a high paced team.
Clearly, but "I believe efficiency differential is slightly better than scoring margin as well" seems to imply that you don't understand this. Teams with good efficiency differentials have good scoring margins. Teams with worse efficiency differentials wave worse scoring margins. How could one be a better indicator than the other if they always track each other?
Efficiency differentials are more accurate about just
how good/bad a team is. Thus while whether or not a team is good or bad would be the same, but just how good is different. By normalizing for pace you get a better picture of the true quality of a team.
For example in 2006-2007:
Record:Mavs 67-15
Suns 61-21
Spurs 58-24
Point Differential:Spurs 8.4
Suns 7.3
Mavs 7.2
Efficiency Differential:Spurs 9.3
Mavs 8.1
Suns 7.5