Dichlor increases CYA more quickly than Trichlor for the same chlorine amount. The chemical rules that are independent of concentration of product are as follows:
For every 10 ppm Free Chlorine (FC) added by Trichlor, it also increases Cyanuric Acid (CYA) by 6 ppm.
For every 10 ppm FC added by Dichlor, it also increases CYA by 9 ppm.
For every 10 ppm FC added by Cal-Hypo, it also increases Calcium Hardness (CH) by 7 ppm.
I don't know the weight of the BioGuard Smart Sticks so can't tell you how much each will increase CYA. I can tell you that one pound (16 ounces weight) of Trichlor in 25,000 gallons will increase the FC by 4.4 ppm and the CYA by 2.7 ppm.
Richard