This is not my data, but interesting, nonetheless:
There are several types of sythetic the base stock is what differentates them.
The best base stock is Polyol-ester (Redline & Motul)
Next best Di-ester (Royal Purple, Amsoil, Neo)
Next is polyolefin polyamine (Mobil 1)
Hydrocracked (Syntec, Valvoline)
Finally regular dyno oils