I'm not familiar with the St. Jude's pig valve, though I got a different pig valve (see my Signature). Based on the latest studies I've seen on the durability of the oldest, most established valves -- the ones that have been used and studies long enough to have 15-year and 20-year follow-up -- I think the Edwards (or "CE) Perimount "cow" valve looks like the second best one, second only to "my" pig valve! The newest and most complete study is entitled "Hancock II Bioprosthesis for Aortic Valve Replacement: The Gold Standard of Bioprosthetic Valves Durability?" by Tirone E. David, MD, Susan Armstrong, MS, Manjula Maganti, MS, in Ann Thorac Surg 2010;90:775-781, abstract at ats.ctsnetjournals.org/cgi/content/abstract/90/3/775? . You've got to pay some bucks to get the whole study, including the part where they compare their results to those of other studies, including studies on the CE Perimount. But the abstract, with the summarized results, is free at that link.
Of course, many good-looking valves have come along within the last 10 or 15 years, and they can't possibly compete on the basis of proven or demonstrated durability, even though they may end up lasting longer.
My impression is that my pig valve came from a single pig, and was then treated in a number of ways. The "pericardial" valves, including all valves made from cows and horses, are manufactured out of the tough tissue that surrounds these animals' hearts. (I bet it's hard to find a cow or horse's heart valve that's small enough for most humans.) It's tempting to conclude that one approach MUST be better, but that kind of "obvious logic" is often proven wrong in medical studies.
I place a bit more value on choosing a valve that my surgeon is comfortable with, than Lyn and several others here. I don't mind making my Doctors squirm when I'm meeting with them or talking with them on the phone, but I'd really rather they did NOT squirm while they have my heart in their hands!
BAV, extended ARoot, some MV damage.
68 y.o. (65 @OHS), keen active athlete until shortly pre-op, only symptomatic 1-2 months pre-op.
AVR (Medtronics Hancock II) Dec. 1 2010 w/ Dr. C.M. Feindel at UHN aka Toronto General. Also a "tuck" on the Aortic root, and a (Dacron) Medtronics Simplici-T ring on my MV. I did ACT for 3 months for the ring, and Metoprolol (BB) for 3 months for A-fib.