WPC takes ADR's as recently as November 2007. WPC is a full service sit-down restaurant. WPE (either of them) does not take ADR's, they are just fancy looking counter service areas.
Of the 2 places the OP listed, I would say it is a toss up. PH is loud, with tight seating. Food is eh, except for a good burger, and service has been spotty. WPC in November was also loud, with tight seating. Food was good, service was okay. I would go with the menu that best appeals to your group. I believe you would also have good food choices at House of Blues and Raglan Road as well.