im so confused..........need help to Victoria peak Hong Kong!

hi...help me! we want to go to Victoria peak and Peak Tower....going to the garden terminus is not a problem. I am just so confused which one should i take a bus (15c)? or a tram?.....(ticket of one way or two way?...) how much should i pay for?, and what time can you suggest should we go to the terminal? we want to see the sunset....better to see at Victoria peak or Peak Tower? thank you so much!