we are group of 5. which is better transport to see the sights in hongkong?

The two-floor sightseeing bus can be very convenient for you to enjoy the attraction there. Of course, you may also need take subway some times.
Upon arrival at Hk, the Disneyland, Lautan Island (Ngong Ping 360), Ocean Park, Victoria Peak and Victoria Bay and Sky 100 are the must-see attractions.

if we take taxi, it will take all 5 of us? would it be more cheaper than bus or subway? coz we have an old woman with us. thanks