Dichlor has 2 major advantages over lithium hypochlorite:
--pH of dichlor is 7.0 (neutral) where lith pH is between 9-10
--dichlor provides between 56-62% active chlorine and lith provides around 35% active chlorine
Dichlor has 1 disadvantage: it contains about 57% cyanuric acid (a stabilizer) though this is normally not a problem for tub owners since the water is changed regularly.
HTH
BTW, is there a reason why Canada does not allow the sale of dichlor?