Here is my actual experience of actual tyres on actual audax rides
1) 2004-2005 Continental Ultragator Skins, 28mm no punctures on events, 4 or 5 when the tyres got to a worn state during other riding
2) 2005-2007 Pasella Panaracer 28mm, 1 puncture during Poor Student 200km in Jan 2007 and another 4 or 5 during other riding
3) 2007 Continental 4 Seasons 28mm, lots of punctures during events (but none during wet PBP)
Also 2006-2011 used Michelin Pro Race 25mm on several audax rides, no punctures inc very wet potholed Bryan Chapman Scenic 2006
4) 2008 on the dole so used a mixture of worn out tyres from the garage. Lots of punctures
9) 2009 Continental 4 Seasons 28mm, more punctures
10) 2010 Rubino Pro 28mm, 2 punctures during events and a couple when not on events
11) 2011 Michelin Krylion 25mm, not done much mileage on them yet
The Ultragator skins do not have great wet grip and are relatively heavy. But they roll fast
Pasella Panaracer are not quite as fast rolling and robust as the Ultragators but are lighter and grippier
Michelin Pro Race 25mm are the fastest tyres I've ever used, they grip like glue and I've never punctured on them
Continental 4 Seasons are fantastic, right up there with the Michelins until they've done 2000km. Then they puncture all the time and this is tedious
Rubino are similar to the Panaracer Pasella but have a slicker tread
Krylions, can't tell yet but not unpleasant
As someone else said don't run your tyres at 120psi for long distance riding. I am currently on 90 psi front, 100 rear