[Aavso-photometry] Different ways of averaging data

[Pedro Pastor]

I've done a high rate sampling on a Delta Scuti (NSV 3063). While
processing data I saw that, although single point data precision is
around 0.002 mag., data dispersion along the whole series is high.
 
As long as my sampling rate was high, I thought of averaging measures
(every 5 points). Then, a big doubt rose in my mind. What would be
better to average: differential photometry data or raw images (in order
to raise SNR) and then calibrating the result image and get the
differential photometry measure?
 
I've done some tests in order to compare both methods, but my results
don't shed any light on the question. Maybe both procedures are
equivalent?
 
Could anybody provide me with some information (or results) about this
point?
 
Thank you very much.
 
Pedro Pastor