Both have good triggers, both are good enough replicas (theres a couple of things on each where artistic license or economic\technical\legal considerations have taken over), both have faithful and interesting actions and both shoot well.
I feel that the Webley shoots the best, looks the best, is made to a higher standard and is closest to the real thing. The Peacemaker shoots well and accepts DW shells (Pellet and BB) and seems happy shooting pellets from the supplied shells as well, the Webley has to use Webley shells (or modified DW bb Shells). The peacemaker is more fun if you have lots of shells as gate loaders are excellent fun.
It is very close but my Webley has not missed a beat since I got it at launch, my Peacemaker is only a couple of months old and has had several issues. When you strip the peacemaker you realisehow poor the construction is however it does not seem to be a problem for most people.
I would have to choose the Webley but it is very close, were it not for the issues with my Peacemaker I would say both are equal and you need both!
Great Deals with : Dave Dee, Dozy, Beaky, Mick & Tich