WS have higher potential performance, but PB are much easier to build and play even if they can't hit the same levels of power as a WS can under optimal conditions. My highest PB was an Incarnated 50 and my highest WS was 38. After some of the changes to Kheldians i had started to tinker more with finding good builds and strategies for my Warshades but then the game shut down.
Unfortunately I never got to play a WS.. However I believe that same levels of power might be somewhat relative..
My final All Human PB was perma hasten.. perma light form.. perma inner light ( build up ).. perma Essence Boost (Dull Pain)
Same capped resistance as Eclipse but didnt need enemies to do it..
About the same potential Damage Buff but again dont need enemies to do it.
A much smaller self heal in reform essence.. but again.. combined with Perma Essence Boost easy healing and again.. no need of enemies to do so..
Can spawn my own pets in Photon Seekers.. However I think the Dark Fluffys are better..
The stun on the WS is much better than the one on the PB however..
I do have a WS build which is Perma Eclipse.. Perma Hasten,, Sunless Mire and Stygian Circle both recharge very quickly..
So IMHO they are definitely going to be comparable.. hopefully I get the chance to find out