I had drafted a lengthy reply which sadly was lost during the software upgrade/reversion - but I suppose I can summarize it as follows:
If I could only take one light with me to a desert island (along with a big box of batteries) it would be my Peak Pacific. I completely trust it to work every time. That says something.
As for Surefire I believe Peak is on par with them in terms of quality but they are very different lights with different design philosophies and initial target audiences. They are very comparable but not at all the same - these days Peak has taken an almost small job shop approach with lots of customizable options, whereas Surefire has almost always taken a this is what we offer take it or leave it approach. Nothing inherently wrong with either and given the relative size differences of the companies certainly understandable, but if you want to choose the body style, body material, emitter type, tint, beam shape, etc... Peak likely has a combination that will suit your needs and desires.