I have been somewhat wondering the same thing. I think all the different teks usually come out with the same product amount wise and purity wise (unless you're comparing teks where the products in salt form and teks where the products in freebase form). I was hoping maybe a more experienced member could enlighten me a bit on the whole situation.
All in all most of the teks come out with the same or similar products in the end, but that is just me assuming, maybe someone who extracts more than I do will have something to say about it.