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I really do appreciate the fact that I can go online and look up the stamps that have been certified by the Philatelic Foundation (PF), Professional Stamp Experts (PSE), American Philatelic Expertizing Service (APEX), etc. with a search engine on their websites.
I'm familiar with this feature at the PF and APEX websites, but where is it for PSE? The only thing I can find is a cert lookup, which is only useful if you know the exact cert number. You can't search or browse otherwise.
Regarding PF vs. PSE, both firms have their fans and detractors. I think it depends upon what you are wanting the cert for.
If you are wanting something graded (as opposed to expertized), I would recommend PSE, as for better or worse, they have a greater market share of graded certs than the PF. They're the most recognized player in that arena.
For expertizing, it depends on what the item is. In my area, U.S. revenues, Brian Bleckwenn at the PF is a recognized expert on early U.S. revenues. Anecdotally, PF appears to have a better reputation for U.S. material, at least material expertized in the last 2 decades.
Regarding market acceptance, PF and PSE stand well above any of the other expertizing companies, at least when it comes to U.S. stamps and covers. Items with PF or PSE certs will, in general, sell for more than those with APEX, PSAGE, Crowe, Weiss, or other expertizations.
For non-U.S. material, I have very little experience, other than Sismondo certs tend to be generally well regarded.
One last thing though, regarding PF vs. PSE, that circles back to my original question: The PF puts their opinions and certs out there for the world to see, good bad, or otherwise. PSE, as far as I can tell, does not. That makes for a somewhat uneven playing field with respect to criticism. PSE's mistakes are more easily hidden.