Total as of yesterday 4 cups granular stabilizer, have not used dichlor nor trichlor. I have in the past and can get more pronto

The shock I used before is Trichloro-s-trianzinetrione 67%
other ingredients 33%
total100%
Available Chlorine 60.3%

as I have a fiberglass pool does it matter which one? or is the Trichloro better?