WS operates a very efficient turnaround out of the Delta terminal. Is there a PP lounge in that terminal? If so, I am not aware?
Over in the Central Terminal, you have a choice of three lounges (assuming you have the AMEX Platinum card?)
- Air Canada;
- United Club Lounge;
- AMEX Centurion Lounge (my PF!).
Recently, I took the MTA to Central, spent two hours in the AMEX lounge, and then took the purple shuttle over to the Delta Terminal. Very do-able.
Another advantage of AC option? Due to LGA const'n, they will change your ticket for free to EWR.