well, this is no botanist here, but imo:
T-pachs are all over the place alkawise - watch out for those PC's - but then, there is nothing like a good T-Pach, and I mean NOTHING! The best ones strike me as smooth, pure, and astral. They are also harder to identify because so many other varieties of Trich or whatever you call it these days merely
resemble Pach but are not Pach.
T-bridgs are more uniform alkwise, better than weaker Pacs, but not as good as better Pachs. Also, they are much easier to identify, with their thinner stalks, grey-green color, and longer spines. Also, the experience off their alk profile can get pretty distracting...it's much harder for me to mediate with bridg than with Pach. But they can be very strong!
My fav these days is
macrogonus....simpler alk profile, and while similar to Pach in appearance, they are not especially easy for non-experts to identify.
I am also coming to believe that there really is something to the harvesting method: time of day, time of year, part of the plant, etc...I'v seen big variations in the same plant as these parameters vary.
Does it or doesn't it? Only your shaman knows for sure...
WHOA!