TYPE OF MTR CARD TO BUY (DAILY OR OCTOPUS CARD)

I will be travelling to HK this October for 3 days with my family (mum, sister & brother). We will be staying near Tshim Shat Shui metro. Thinking of going to The Peak, Victoria Harbour and Disneyland during our stay there. Please advise what is the suitable card should we buy in order to move around HK??