Brad-
I have a AL cone for the SP600 and an original Ti-Tri (w/ Brasslite 900). The Ti cone is about a half-ounce more (32g vs. 48g), but is also for a larger pot.
The Ti cone has much more memory of the cone shape; that is, you pull it out of its storage container, let go, and it unrolls almost completely. It is also more susceptible to damge. I have gotten a small bend it the metal that won't come out from packing it poorly. The Al one is much softer and will bend very easily, but is easily bent back.
I have only used it for wood once, a test at home, but like having the option. I was not terribly impressed with it. I usually use Esbit with the SP600, and alcohol with the Ti-Tri. If I got into an emergency and needed to burn wood, I think I could do it without the cone. Hard to say wether I would spend the money on the Ti cone again. Last year's WTS3 guys were pretty impressed with the wood-burning IIRC. I have only used my MYOG double-wall woodburner with the Brasslite 900 (my stove sucks!), so I can't comment on the comparison to the Bushbuddy. Hope my ramblings help!
-Tim