IMO, this is one of those mythological areas of the flute world. I have to side with the position that the wood/metal dichotomy for piccs is, in general, pretty much a false one and yet another unfortunate fad that the industry has conned many people into (that wood is better than metal, and that no decent picc player would even consider performing on metal). Maybe I'm overly cynical, but I don't think it's a coincidence that wood piccs tend to be more expensive, and bring with them a plethora of other worries that require more maintenance and extra $upplie$; or even an entirely new in$trument if a $eriou$ crack develop$ that cannot be adequately repaired. We see a similar thing right now with flutes. It used to be that you were a nobody professionally unless you perform on a sterling, gold, or platinum flute. We know now that very high quality flutes can be plated and sound every bit as good as one made with more precious materials. And that's because the industry, IMO, does not adequately factor in the
player's attributes and abilities.
I hope not to offend anybody, but in the 30+ years I've been involved with this wonderful instrument it seems to me that flutists are pretty gullible when it comes to things. A new gimmick comes out, one of our flute royals gets paid a small fortune to endorse it, and everybody seems to jump on it without much thought. I remember back when Haynes came out with their "new" scale and everybody was dumping their older Haynes's to get one of those; they turned out to be, in most cases, pretty horrible. I didn't complain, though, because I was the lucky recipient of one of the old Haynes's someone was trying to get rid of

(the woman who sold it to me actually wanted to buy it back after getting a new, rather disappointing, Haynes). I still play on this instrument and am very proud to be the owner of one of these vintage gems. There's nothing like an old Haynes, IMO

.
Anyway, with regard to piccs. One should buy what one sounds best on for the circumstances in which s/he performs. It really is that simple, but it takes commitment to put in the effort to determine that and a willingness to stand up to rumors and indu$try $ale$ technique$. To be very clear, I'm not calling flutemakers swindlers; not at all. I'm just saying that they use many ways to market their product (like anybody else). Some of it is bunk and some is not. But you must at all times check out the claims made.
Sorry to go off on a little tangent
SK