In general, 5 in1 has less side effect. ~HK$500 per 1, total HK$1,500 can get rid of worrying for the side effects, it really worth.
Besides, some belives the vaccins are more pure in C+ than in government, I buy that also. Because the costs of each vaccin in C+ is about HK$300, but only HK$X0 in government, the quality should be better.