I'd say the ironbird but.... Trey played the older style red ironbird for almost all of his career. (BC Rich collectors speak of the mark-I shape) His new one is different on all angles and not as iconic IMO.
It is gonna be hard to find one. His is a International series, a cheap import. Which has seen many different trems, pups and whatever. He has had a Ibby edge trem to the Schaller on it. And many different necks. Indeed a paf-pro combined with a fasttrack.
A phase switch puts the coils out of phase creating a vewry thin and trebly sound. He uses that in combination with his spacy effects. Single coil splits the bucker to one coil for strat-like sounds.
The bevels on the International body are also different than all the older NJ, Rave and Platinum series, as well as on the never Class-axe mark-II shaped Riches and newer (around 2002) import mark-II shaped NJ and Platinum-pro series and the recent Ironbird-pro.
Among the older mark-I shapes of which you will mostly find imports (if you are lucky finding any at all) a lot of them are utter crap, the older Platinum (not to be mistaken with the newer Platinum-pro, totally different guitars), Rave and a lot of the older NJ were plywood. It is hard to know which to buy as the BC rich data on older series is almost non exsistent. I have a shitload of older catalogues but the plywood ones are never really specified. Although there are some good solid wood guitars in those series.
My first guitar was a red ironbird. It left me in a bad manner and since then i've been on a bird quest. I own five of them varing in quality. Two late eighties plywood ones, of which one sounds pretty good actually. Two mid era of the gloryhole japanese made IG-400 which are very nice and comparable to high-end ibbys. And one neck-thru US series which were made in Japan and assembled in the US with the same components as the US-made models. Next to that i have a 7string one which a fellating lover of mine made for me and i have a red sevenstring on order from the hard-on bearer who build my 7string explorer. (I hope that will cure my Ironbird trauma

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I've been doing reasearch on ironbirds for the last 20 or more years, if you wanna know more let me know.