You mean like this?
This is my new baby (Dingwall Super P5) scheduled to be here 11/8/13.
I am not an engineer so I can't offer anything at that level.
As a player (and speaking with great ignorance) there are clearly two different things going on here. Angled on Dings because of the 35 inch B scale versus 32.5 on the G.
Pick ups reversed after advice from the from Grand Wazoo that was able to play the prototype and compare to normal Dingwall P Tone pick up placement.
He stated that reverse P added a hint more articulation to the B, while warming/softening edge/attack of the G just a hair. Most important issue for reverse P set up was uniform tone and attack from string to string.
In the end I think it is simply bite/clarity versus warmth, which is likely magnified as you move the entire pick up closer to the bridge.
Which one works best? I honestly have no idea. It may come down purely to individual tonal taste.
Finally, I suspect that pick up winding/voicing would play a huge role in how it responds to an angled adjustment/placement.