I think you mean cal-hypo, not di-chlor, as di-chlor adds CYA faster than Tri-chlor. Di-Chlor does NOT add calcium, Cal-hypo does. If your CYA goal was higher (like for a SWCG or southern clime), the tri-chlor would be good as it would lower your pH as well.

FYI: Tri-chlor add about 6ppm of CYA for every 10ppm of FC, while Di-chlor add about 9ppm of CYA for every 10ppm of FC, but tri-chlor is much more acidic.