Jacta alea est...
I have ordered the Pilot Road 4, standard version (since I found out that this is recommended for the Griso).
The reason is the outstanding test results this tire gets on wet and slippery roads (painted stripes, etc), even better than the Angel GT...
I have previously had the PR2s, and I also found them a bit too hard. The PR 4 tires however, are using a dual compund technology with softer compound on the sides, and the rear tire also has a center line of hard compound for long milage.
Anyway, I am sure both tires are more than good enough for me and my riding, - time will show...