As you know, a composite chart is a blending of two different charts, by looking at the mathematical midpoints of the various planets and points to come up with a merged chart. So, already we are no longer dealing with a true birth since the individuals have different birth times -- it's already looking at a kind of symbolic representation of the relationship between two people. A progressed composite first progresses each individual's chart to a certain date, and then calculates the Composite based on those progressed charts. So, it is kind of a symbolic representation of the potentials each individual had based on the seed of their Natal chart, which it then "blends" into one Composite chart.
However, Davison charts have "time and space" reality—these charts are drawn for real points in time and space, and include phenomena (such as retrogrades and eclipses) that composite charts do not.
1) In composites I disregard planetary sign placements and instead focus on houses where the planets fall and on aspects. The composite Sun is the most important. 2) Aspects that occur in both natals and in the composite/davison will be psychological issues that need to be worked on in the relationship. 3) Aspects that occur in the composite but not in the natals are issues rising within the relationship that have not been dealt with before by either party. 4) In Davison the main difference is to look at sign placement, whilst ignore sign placement in the composite. Also look for sign strength and weakness, mutual reception, sole dispositors. 5) In both ‘composites’ and ‘Davisons’, look for midpoints that are conjoined by planets in either natal. In composites, these relationships seem to be referring to psychological issues, while in ‘Davidsons’, the midpoint relationships tend to refer to forces acting on the couple from outside the relationship. 6) Try putting your natal planets around the outside of either chart, to see who relates best to this relationship and who is gaining the most. This can be rather revealing 7) Also remember you can use transits over both these charts and again Angles are very sensitive points http://www.astrologyweekly.com/forum/showpost.php?p=180956&postcount=11
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