I agree on matches as I can see the advantage of Three Ring Circus over Regular. However, when it comes to angles, here are the descriptions as I see it:
The rating is calculated as 70% of the highest rated angle, 20% of the second highest rated angle, and 10% of the third highest rated angles. If there aren't enough angles to do this then the highest rated angle's percentage is increased to make up the difference.
The rating is calculated as being the average of the three highest rated angles. If there are less than three angles then the average of the remaining angles is used.
Both of them uses a max of 3 angles. This is unlike matches, where the 10% is the average of the entire undercard barring the match used for the 20%. This is just 3 angles and the other angles are completely ignored. So we are looking at this distribution:
70%/20%/10%
VS
33%/33%/33%
I plugged in a lot of numbers into an excel sheet just to compare and "70%/20%/10%" always yield better result no matter what. Hence, I don't get the benefit of highlight focus at all -- unless the description is incorrect and highlight focus is calculated differently and that is reflected in your testing.